SWCU185F january   2018  – march 2023 CC1312R , CC1352P , CC1352R , CC2642R , CC2642R-Q1 , CC2652P , CC2652PSIP , CC2652R , CC2652RB , CC2652RSIP , CC2662R-Q1

 

  1.   Read This First
    1.     About This Manual
    2.     Devices
    3.     Register, Field, and Bit Calls
    4.     Related Documentation
    5. 1.1 Trademarks
  2. 2 Architectural Overview
    1. 2.1 Target Applications
    2. 2.2 Overview
    3. 2.3 Functional Overview
      1. 2.3.1  Arm® Cortex®-M4F
        1. 2.3.1.1 Processor Core
        2. 2.3.1.2 System Timer (SysTick)
        3. 2.3.1.3 Nested Vector Interrupt Controller (NVIC)
        4. 2.3.1.4 System Control Block
      2. 2.3.2  On-Chip Memory
        1. 2.3.2.1 SRAM
        2. 2.3.2.2 Flash Memory
        3. 2.3.2.3 ROM
      3. 2.3.3  Radio
      4. 2.3.4  Security Core
      5. 2.3.5  General-Purpose Timers
        1. 2.3.5.1 Watchdog Timer
        2. 2.3.5.2 Always-On Domain
      6. 2.3.6  Direct Memory Access
      7. 2.3.7  System Control and Clock
      8. 2.3.8  Serial Communication Peripherals
        1. 2.3.8.1 UART
        2. 2.3.8.2 I2C
        3. 2.3.8.3 I2S
        4. 2.3.8.4 SSI
      9. 2.3.9  Programmable I/Os
      10. 2.3.10 Sensor Controller
      11. 2.3.11 Random Number Generator
      12. 2.3.12 cJTAG and JTAG
      13. 2.3.13 Power Supply System
        1. 2.3.13.1 Supply System
          1. 2.3.13.1.1 VDDS
          2. 2.3.13.1.2 VDDR
          3. 2.3.13.1.3 Digital Core Supply
          4. 2.3.13.1.4 Other Internal Supplies
        2. 2.3.13.2 DC/DC Converter
  3. 3 Arm® Cortex®-M4F Processor
    1. 3.1 Arm® Cortex®-M4F Processor Introduction
    2. 3.2 Block Diagram
    3. 3.3 Overview
      1. 3.3.1 System-Level Interface
      2. 3.3.2 Integrated Configurable Debug
      3. 3.3.3 Trace Port Interface Unit
      4. 3.3.4 Floating Point Unit (FPU)
      5. 3.3.5 Memory Protection Unit (MPU)
      6. 3.3.6 Arm® Cortex®-M4F System Component Details
    4. 3.4 Programming Model
      1. 3.4.1 Processor Mode and Privilege Levels for Software Execution
      2. 3.4.2 Stacks
      3. 3.4.3 Exceptions and Interrupts
      4. 3.4.4 Data Types
    5. 3.5 Arm® Cortex®-M4F Core Registers
      1. 3.5.1 Core Register Map
      2. 3.5.2 Core Register Descriptions
        1. 3.5.2.1  Cortex®General-Purpose Register 0 (R0)
        2. 3.5.2.2  Cortex® General-Purpose Register 1 (R1)
        3. 3.5.2.3  Cortex® General-Purpose Register 2 (R2)
        4. 3.5.2.4  Cortex® General-Purpose Register 3 (R3)
        5. 3.5.2.5  Cortex® General-Purpose Register 4 (R4)
        6. 3.5.2.6  Cortex® General-Purpose Register 5 (R5)
        7. 3.5.2.7  Cortex® General-Purpose Register 6 (R6)
        8. 3.5.2.8  Cortex® General-Purpose Register 7 (R7)
        9. 3.5.2.9  Cortex® General-Purpose Register 8 (R8)
        10. 3.5.2.10 Cortex® General-Purpose Register 9 (R9)
        11. 3.5.2.11 Cortex® General-Purpose Register 10 (R10)
        12. 3.5.2.12 Cortex® General-Purpose Register 11 (R11)
        13. 3.5.2.13 Cortex® General-Purpose Register 12 (R12)
        14. 3.5.2.14 Stack Pointer (SP)
        15. 3.5.2.15 Link Register (LR)
        16. 3.5.2.16 Program Counter (PC)
        17. 3.5.2.17 Program Status Register (PSR)
        18. 3.5.2.18 Priority Mask Register (PRIMASK)
        19. 3.5.2.19 Fault Mask Register (FAULTMASK)
        20. 3.5.2.20 Base Priority Mask Register (BASEPRI)
        21. 3.5.2.21 Control Register (CONTROL)
    6. 3.6 Instruction Set Summary
      1. 3.6.1 Arm® Cortex®-M4F Instructions
      2. 3.6.2 Load and Store Timings
      3. 3.6.3 Binary Compatibility With Other Cortex® Processors
    7. 3.7 Floating Point Unit (FPU)
      1. 3.7.1 About the FPU
      2. 3.7.2 FPU Functional Description
        1. 3.7.2.1 FPU Views of the Register Bank
        2. 3.7.2.2 Modes of Operation
          1. 3.7.2.2.1 Full-Compliance Mode
          2. 3.7.2.2.2 Flush-to-Zero Mode
          3. 3.7.2.2.3 Default NaN Mode
        3. 3.7.2.3 FPU Instruction Set
        4. 3.7.2.4 Compliance With the IEEE 754 Standard
        5. 3.7.2.5 Complete Implementation of the IEEE 754 Standard
        6. 3.7.2.6 IEEE 754 Standard Implementation Choices
          1. 3.7.2.6.1 NaN Handling
          2. 3.7.2.6.2 Comparisons
          3. 3.7.2.6.3 Underflow
        7. 3.7.2.7 Exceptions
      3. 3.7.3 FPU Programmers Model
        1. 3.7.3.1 Enabling the FPU
          1. 3.7.3.1.1 Enabling the FPU
    8. 3.8 Memory Protection Unit (MPU)
      1. 3.8.1 About the MPU
      2. 3.8.2 MPU Functional Description
      3. 3.8.3 MPU Programmers Model
    9. 3.9 Arm® Cortex®-M4F Processor Registers
      1. 3.9.1 CPU_DWT Registers
      2. 3.9.2 CPU_FPB Registers
      3. 3.9.3 CPU_ITM Registers
      4. 3.9.4 CPU_SCS Registers
      5. 3.9.5 CPU_TPIU Registers
  4. 4 Memory Map
    1. 4.1 Memory Map
  5. 5 Arm® Cortex®-M4F Peripherals
    1. 5.1 Arm® Cortex®-M4F Peripherals Introduction
    2. 5.2 Functional Description
      1. 5.2.1 SysTick
      2. 5.2.2 NVIC
        1. 5.2.2.1 Level-Sensitive and Pulse Interrupts
        2. 5.2.2.2 Hardware and Software Control of Interrupts
      3. 5.2.3 SCB
      4. 5.2.4 ITM
      5. 5.2.5 FPB
      6. 5.2.6 TPIU
      7. 5.2.7 DWT
  6. 6 Interrupts and Events
    1. 6.1 Exception Model
      1. 6.1.1 Exception States
      2. 6.1.2 Exception Types
      3. 6.1.3 Exception Handlers
      4. 6.1.4 Vector Table
      5. 6.1.5 Exception Priorities
      6. 6.1.6 Interrupt Priority Grouping
      7. 6.1.7 Exception Entry and Return
        1. 6.1.7.1 Exception Entry
        2. 6.1.7.2 Exception Return
    2. 6.2 Fault Handling
      1. 6.2.1 Fault Types
      2. 6.2.2 Fault Escalation and Hard Faults
      3. 6.2.3 Fault Status Registers and Fault Address Registers
      4. 6.2.4 Lockup
    3. 6.3 Event Fabric
      1. 6.3.1 Introduction
      2. 6.3.2 Event Fabric Overview
        1. 6.3.2.1 Registers
    4. 6.4 AON Event Fabric
      1. 6.4.1 Common Input Event List
      2. 6.4.2 Event Subscribers
        1. 6.4.2.1 Wake-Up Controller (WUC)
        2. 6.4.2.2 Real-Time Clock
        3. 6.4.2.3 MCU Event Fabric
    5. 6.5 MCU Event Fabric
      1. 6.5.1 Common Input Event List
      2. 6.5.2 Event Subscribers
        1. 6.5.2.1 System CPU
        2. 6.5.2.2 NMI
        3. 6.5.2.3 Freeze
    6. 6.6 AON Events
    7. 6.7 Interrupts and Events Registers
      1. 6.7.1 AON_EVENT Registers
      2. 6.7.2 EVENT Registers
  7. 7 JTAG Interface
    1. 7.1  Top-Level Debug System
    2. 7.2  cJTAG
      1. 7.2.1 cJTAG Commands
        1. 7.2.1.1 Mandatory Commands
      2. 7.2.2 Programming Sequences
        1. 7.2.2.1 Opening Command Window
        2. 7.2.2.2 Changing to 4-Pin Mode
        3. 7.2.2.3 Close Command Window
    3. 7.3  ICEPick
      1. 7.3.1 Secondary TAPs
        1. 7.3.1.1 Slave DAP (CPU DAP)
        2. 7.3.1.2 Ordering Slave TAPs and DAPs
      2. 7.3.2 ICEPick Registers
        1. 7.3.2.1 IR Instructions
        2. 7.3.2.2 Data Shift Register
        3. 7.3.2.3 Instruction Register
        4. 7.3.2.4 Bypass Register
        5. 7.3.2.5 Device Identification Register
        6. 7.3.2.6 User Code Register
        7. 7.3.2.7 ICEPick Identification Register
        8. 7.3.2.8 Connect Register
      3. 7.3.3 Router Scan Chain
      4. 7.3.4 TAP Routing Registers
        1. 7.3.4.1 ICEPick Control Block
          1. 7.3.4.1.1 All0s Register
          2. 7.3.4.1.2 ICEPick Control Register
          3. 7.3.4.1.3 Linking Mode Register
        2. 7.3.4.2 Test TAP Linking Block
          1. 7.3.4.2.1 Secondary Test TAP Register
        3. 7.3.4.3 Debug TAP Linking Block
          1. 7.3.4.3.1 Secondary Debug TAP Register
    4. 7.4  ICEMelter
    5. 7.5  Serial Wire Viewer (SWV)
    6. 7.6  Halt In Boot (HIB)
    7. 7.7  Debug and Shutdown
    8. 7.8  Debug Features Supported Through WUC TAP
    9. 7.9  Profiler Register
    10. 7.10 Boundary Scan
  8. 8 Power, Reset, and Clock Management (PRCM)
    1. 8.1 Introduction
    2. 8.2 System CPU Mode
    3. 8.3 Supply System
      1. 8.3.1 Internal DC/DC Converter and Global LDO
    4. 8.4 Digital Power Partitioning
      1. 8.4.1 MCU_VD
        1. 8.4.1.1 MCU_VD Power Domains
      2. 8.4.2 AON_VD
        1. 8.4.2.1 AON_VD Power Domains
    5. 8.5 Clock Management
      1. 8.5.1 System Clocks
        1. 8.5.1.1 Controlling the Oscillators
      2. 8.5.2 Clocks in MCU_VD
        1. 8.5.2.1 Clock Gating
        2. 8.5.2.2 Scaler to GPTs
        3. 8.5.2.3 Scaler to WDT
      3. 8.5.3 Clocks in AON_VD
    6. 8.6 Power Modes
      1. 8.6.1 Start-Up State
      2. 8.6.2 Active Mode
      3. 8.6.3 Idle Mode
      4. 8.6.4 Standby Mode
      5. 8.6.5 Shutdown Mode
    7. 8.7 Reset
      1. 8.7.1 System Resets
        1. 8.7.1.1 Clock Loss Detection
        2. 8.7.1.2 Software-Initiated System Reset
        3. 8.7.1.3 Warm Reset Converted to System Reset
      2. 8.7.2 Reset of the MCU_VD Power Domains and Modules
      3. 8.7.3 Reset of AON_VD
    8. 8.8 PRCM Registers
      1. 8.8.1 DDI_0_OSC Registers
      2. 8.8.2 PRCM Registers
      3. 8.8.3 AON_PMCTL Registers
  9. 9 Versatile Instruction Memory System (VIMS)
    1. 9.1 Introduction
    2. 9.2 VIMS Configurations
      1. 9.2.1 VIMS Modes
        1. 9.2.1.1 GPRAM Mode
        2. 9.2.1.2 Off Mode
        3. 9.2.1.3 Cache Mode
      2. 9.2.2 VIMS FLASH Line Buffers
      3. 9.2.3 VIMS Arbitration
      4. 9.2.4 VIMS Cache TAG Prefetch
    3. 9.3 VIMS Software Remarks
      1. 9.3.1 FLASH Program or Update
      2. 9.3.2 VIMS Retention
        1. 9.3.2.1 Mode 1
        2. 9.3.2.2 Mode 2
        3. 9.3.2.3 Mode 3
    4. 9.4 ROM
    5. 9.5 FLASH
      1. 9.5.1 FLASH Memory Protection
      2. 9.5.2 Memory Programming
      3. 9.5.3 FLASH Memory Programming
      4. 9.5.4 Power Management Requirements
    6. 9.6 ROM Functions
    7. 9.7 VIMS Registers
      1. 9.7.1 FLASH Registers
      2. 9.7.2 VIMS Registers
  10. 10SRAM
    1. 10.1 Introduction
    2. 10.2 Main Features
    3. 10.3 Data Retention
    4. 10.4 Parity and SRAM Error Support
    5. 10.5 SRAM Auto-Initialization
    6. 10.6 Parity Debug Behavior
    7. 10.7 SRAM Registers
      1. 10.7.1 SRAM_MMR Registers
      2. 10.7.2 SRAM Registers
  11. 11Bootloader
    1. 11.1 Bootloader Functionality
      1. 11.1.1 Bootloader Disabling
      2. 11.1.2 Bootloader Backdoor
    2. 11.2 Bootloader Interfaces
      1. 11.2.1 Packet Handling
        1. 11.2.1.1 Packet Acknowledge and Not-Acknowledge Bytes
      2. 11.2.2 Transport Layer
        1. 11.2.2.1 UART Transport
          1. 11.2.2.1.1 UART Baud Rate Automatic Detection
        2. 11.2.2.2 SSI Transport
      3. 11.2.3 Serial Bus Commands
        1. 11.2.3.1  COMMAND_PING
        2. 11.2.3.2  COMMAND_DOWNLOAD
        3. 11.2.3.3  COMMAND_SEND_DATA
        4. 11.2.3.4  COMMAND_SECTOR_ERASE
        5. 11.2.3.5  COMMAND_GET_STATUS
        6. 11.2.3.6  COMMAND_RESET
        7. 11.2.3.7  COMMAND_GET_CHIP_ID
        8. 11.2.3.8  COMMAND_CRC32
        9. 11.2.3.9  COMMAND_BANK_ERASE
        10. 11.2.3.10 COMMAND_MEMORY_READ
        11. 11.2.3.11 COMMAND_MEMORY_WRITE
        12. 11.2.3.12 COMMAND_SET_CCFG
        13. 11.2.3.13 COMMAND_DOWNLOAD_CRC
  12. 12Device Configuration
    1. 12.1 Customer Configuration (CCFG)
    2. 12.2 CCFG Registers
      1. 12.2.1 CCFG Registers
    3. 12.3 Factory Configuration (FCFG)
    4. 12.4 FCFG Registers
      1. 12.4.1 FCFG1 Registers
  13. 13Cryptography
    1. 13.1 AES and Hash Cryptoprocessor Introduction
    2. 13.2 Functional Description
      1. 13.2.1 Debug Capabilities
      2. 13.2.2 Exception Handling
    3. 13.3 Power Management and Sleep Modes
    4. 13.4 Hardware Description
      1. 13.4.1 AHB Slave Bus
      2. 13.4.2 AHB Master Bus
      3. 13.4.3 Interrupts
    5. 13.5 Module Description
      1. 13.5.1 Introduction
      2. 13.5.2 Module Memory Map
      3. 13.5.3 DMA Controller
        1. 13.5.3.1 Internal Operation
        2. 13.5.3.2 Supported DMA Operations
      4. 13.5.4 Master Control and Select Module
        1. 13.5.4.1 Algorithm Select Register
          1. 13.5.4.1.1 Algorithm Select
        2. 13.5.4.2 Master PROT Enable
          1. 13.5.4.2.1 Master PROT-Privileged Access-Enable
        3. 13.5.4.3 Software Reset
      5. 13.5.5 AES Engine
        1. 13.5.5.1 Second Key Registers (Internal, But Clearable)
        2. 13.5.5.2 AES Initialization Vector (IV) Registers
        3. 13.5.5.3 AES I/O Buffer Control, Mode, and Length Registers
        4. 13.5.5.4 Data Input and Output Registers
        5. 13.5.5.5 TAG Registers
      6. 13.5.6 Key Area Registers
        1. 13.5.6.1 Key Write Area Register
        2. 13.5.6.2 Key Written Area Register
        3. 13.5.6.3 Key Size Register
        4. 13.5.6.4 Key Store Read Area Register
        5. 13.5.6.5 Hash Engine
    6. 13.6 AES Module Performance
      1. 13.6.1 Introduction
      2. 13.6.2 Performance for DMA-Based Operations
    7. 13.7 Programming Guidelines
      1. 13.7.1 One-Time Initialization After a Reset
      2. 13.7.2 DMAC and Master Control
        1. 13.7.2.1 Regular Use
        2. 13.7.2.2 Interrupting DMA Transfers
        3. 13.7.2.3 Interrupts, Hardware, and Software Synchronization
      3. 13.7.3 Hashing
        1. 13.7.3.1 Data Format and Byte Order
        2. 13.7.3.2 Basic Hash With Data From DMA
          1. 13.7.3.2.1 New Hash Session With Digest Read Through Slave
          2. 13.7.3.2.2 New Hash Session With Digest to External Memory
          3. 13.7.3.2.3 Resumed Hash Session
        3. 13.7.3.3 HMAC
          1. 13.7.3.3.1 Secure HMAC
        4. 13.7.3.4 Alternative Basic Hash Where Data Originates From Slave Interface
          1. 13.7.3.4.1 New Hash Session
          2. 13.7.3.4.2 Resumed Hash Session
      4. 13.7.4 Encryption and Decryption
        1. 13.7.4.1 Data Format and Byte Order
        2. 13.7.4.2 Key Store
          1. 13.7.4.2.1 Load Keys From External Memory
        3. 13.7.4.3 Basic AES Modes
          1. 13.7.4.3.1 AES-ECB
          2. 13.7.4.3.2 AES-CBC
          3. 13.7.4.3.3 AES-CTR
          4. 13.7.4.3.4 Programming Sequence With DMA Data
        4. 13.7.4.4 CBC-MAC
          1. 13.7.4.4.1 Programming Sequence for CBC-MAC
        5. 13.7.4.5 AES-CCM
          1. 13.7.4.5.1 Programming Sequence for AES-CCM
        6. 13.7.4.6 AES-GCM
          1. 13.7.4.6.1 Programming Sequence for AES-GCM
      5. 13.7.5 Exceptions Handling
        1. 13.7.5.1 Soft Reset
        2. 13.7.5.2 External Port Errors
        3. 13.7.5.3 Key Store Errors
          1. 13.7.5.3.1 PKA Engine
          2. 13.7.5.3.2 Functional Description
            1. 13.7.5.3.2.1 Module Architecture
          3. 13.7.5.3.3 PKA RAM
            1. 13.7.5.3.3.1 PKCP Operations
            2. 13.7.5.3.3.2 Sequencer Operations
              1. 13.7.5.3.3.2.1 Modular Exponentiation Operations
              2. 13.7.5.3.3.2.2 Modular Inversion Operation
              3. 13.7.5.3.3.2.3 Performance
              4. 13.7.5.3.3.2.4 ECC Operations
              5. 13.7.5.3.3.2.5 Performance
              6. 13.7.5.3.3.2.6 ExpMod Performance
              7. 13.7.5.3.3.2.7 Modular Inversion Performance
              8. 13.7.5.3.3.2.8 ECC Operation Performance
            3. 13.7.5.3.3.3 Sequencer ROM Behavior and Interfaces
            4. 13.7.5.3.3.4 Register Configurations
            5. 13.7.5.3.3.5 Operation Sequence
    8. 13.8 Conventions and Compliances
      1. 13.8.1 Conventions Used in This Manual
        1. 13.8.1.1 Terminology
        2. 13.8.1.2 Formulas and Nomenclature
      2. 13.8.2 Compliance
    9. 13.9 Cryptography Registers
      1. 13.9.1 CRYPTO Registers
  14. 14I/O Controller (IOC)
    1. 14.1  Introduction
    2. 14.2  IOC Overview
    3. 14.3  I/O Mapping and Configuration
      1. 14.3.1 Basic I/O Mapping
      2. 14.3.2 Mapping AUXIOs to DIO Pins
      3. 14.3.3 Control External LNA/PA (Range Extender) With I/Os
      4. 14.3.4 Map the 32 kHz System Clock (LF Clock) to DIO
    4. 14.4  Edge Detection on DIO Pins
      1. 14.4.1 Configure DIO as GPIO Input to Generate Interrupt on EDGE DETECT
    5. 14.5  Unused I/O Pins
    6. 14.6  GPIO
    7. 14.7  I/O Pin Capability
    8. 14.8  Peripheral PORTIDs
    9. 14.9  I/O Pins
      1. 14.9.1 Input/Output Modes
        1. 14.9.1.1 Physical Pin
        2. 14.9.1.2 Pin Configuration
    10. 14.10 IOC Registers
      1. 14.10.1 AON_IOC Registers
      2. 14.10.2 GPIO Registers
      3. 14.10.3 IOC Registers
  15. 15Micro Direct Memory Access (µDMA)
    1. 15.1 μDMA Introduction
    2. 15.2 Block Diagram
    3. 15.3 Functional Description
      1. 15.3.1  Channel Assignments
      2. 15.3.2  Priority
      3. 15.3.3  Arbitration Size
      4. 15.3.4  Request Types
        1. 15.3.4.1 Single Request
        2. 15.3.4.2 Burst Request
      5. 15.3.5  Channel Configuration
      6. 15.3.6  Transfer Modes
        1. 15.3.6.1 Stop Mode
        2. 15.3.6.2 Basic Mode
        3. 15.3.6.3 Auto Mode
        4. 15.3.6.4 Ping-Pong
        5. 15.3.6.5 Memory Scatter-Gather Mode
        6. 15.3.6.6 Peripheral Scatter-Gather Mode
      7. 15.3.7  Transfer Size and Increments
      8. 15.3.8  Peripheral Interface
      9. 15.3.9  Software Request
      10. 15.3.10 Interrupts and Errors
    4. 15.4 Initialization and Configuration
      1. 15.4.1 Module Initialization
      2. 15.4.2 Configuring a Memory-to-Memory Transfer
        1. 15.4.2.1 Configure the Channel Attributes
        2. 15.4.2.2 Configure the Channel Control Structure
        3. 15.4.2.3 Start the Transfer
    5. 15.5 µDMA Registers
      1. 15.5.1 UDMA Registers
  16. 16Timers
    1. 16.1 General-Purpose Timers
    2. 16.2 Block Diagram
    3. 16.3 Functional Description
      1. 16.3.1 GPTM Reset Conditions
      2. 16.3.2 Timer Modes
        1. 16.3.2.1 One-Shot or Periodic Timer Mode
        2. 16.3.2.2 Input Edge-Count Mode
        3. 16.3.2.3 Input Edge-Time Mode
        4. 16.3.2.4 PWM Mode
        5. 16.3.2.5 Wait-for-Trigger Mode
      3. 16.3.3 Synchronizing GPT Blocks
      4. 16.3.4 Accessing Concatenated 16- and 32-Bit GPTM Register Values
    4. 16.4 Initialization and Configuration
      1. 16.4.1 One-Shot and Periodic Timer Modes
      2. 16.4.2 Input Edge-Count Mode
      3. 16.4.3 Input Edge-Timing Mode
      4. 16.4.4 PWM Mode
      5. 16.4.5 Producing DMA Trigger Events
    5. 16.5 GPTM Registers
      1. 16.5.1 GPT Registers
  17. 17Real-Time Clock (RTC)
    1. 17.1 Introduction
    2. 17.2 Functional Specifications
      1. 17.2.1 Functional Overview
      2. 17.2.2 Free-Running Counter
      3. 17.2.3 Channels
        1. 17.2.3.1 Capture and Compare
      4. 17.2.4 Events
    3. 17.3 RTC Register Information
      1. 17.3.1 Register Access
      2. 17.3.2 Entering Sleep and Wakeup From Sleep
      3. 17.3.3 AON_RTC:SYNC Register
    4. 17.4 RTC Registers
      1. 17.4.1 AON_RTC Registers
  18. 18Watchdog Timer (WDT)
    1. 18.1 Introduction
    2. 18.2 Functional Description
    3. 18.3 Initialization and Configuration
    4. 18.4 WDT Registers
      1. 18.4.1 WDT Registers
  19. 19True Random Number Generator (TRNG)
    1. 19.1 Introduction
    2. 19.2 Block Diagram
    3. 19.3 TRNG Software Reset
    4. 19.4 Interrupt Requests
    5. 19.5 TRNG Operation Description
      1. 19.5.1 TRNG Shutdown
      2. 19.5.2 TRNG Alarms
      3. 19.5.3 TRNG Entropy
    6. 19.6 TRNG Low-Level Programing Guide
      1. 19.6.1 Initialization
        1. 19.6.1.1 Interfacing Modules
        2. 19.6.1.2 TRNG Main Sequence
        3. 19.6.1.3 TRNG Operating Modes
          1. 19.6.1.3.1 Polling Mode
          2. 19.6.1.3.2 Interrupt Mode
    7. 19.7 TRNG Registers
      1. 19.7.1 TRNG Registers
  20. 20AUX Domain Sensor Controller and Peripherals
    1. 20.1 Introduction
      1. 20.1.1 AUX Block Diagram
    2. 20.2 Power and Clock Management
      1. 20.2.1 Operational Modes
        1. 20.2.1.1 Dual-Rate AUX Clock
      2. 20.2.2 Use Scenarios
        1. 20.2.2.1 MCU
        2. 20.2.2.2 Sensor Controller
      3. 20.2.3 SCE Clock Emulation
      4. 20.2.4 AUX RAM Retention
    3. 20.3 Sensor Controller
      1. 20.3.1 Sensor Controller Studio
        1. 20.3.1.1 Programming Model
        2. 20.3.1.2 Task Development
        3. 20.3.1.3 Task Testing, Task Debugging and Run-Time Logging
        4. 20.3.1.4 Documentation
      2. 20.3.2 Sensor Controller Engine (SCE)
        1. 20.3.2.1  Registers
          1.        Pipeline Hazards
        2. 20.3.2.2  Memory Architecture
          1.        Memory Access to Instructions and Data
          2.        I/O Access to Module Registers
        3. 20.3.2.3  Program Flow
          1.        Zero-Overhead Loop
        4. 20.3.2.4  Instruction Set
          1. 20.3.2.4.1 Instruction Timing
          2. 20.3.2.4.2 Instruction Prefix
          3. 20.3.2.4.3 Instructions
        5. 20.3.2.5  SCE Event Interface
        6. 20.3.2.6  Math Accelerator (MAC)
        7. 20.3.2.7  Programmable Microsecond Delay
        8. 20.3.2.8  Wake-Up Event Handling
        9. 20.3.2.9  Access to AON Domain Registers
        10. 20.3.2.10 VDDR Recharge
    4. 20.4 Digital Peripheral Modules
      1. 20.4.1 Overview
        1. 20.4.1.1 DDI Control-Configuration
      2. 20.4.2 AIODIO
        1. 20.4.2.1 Introduction
        2. 20.4.2.2 Functional Description
          1. 20.4.2.2.1 Mapping to DIO Pins
          2. 20.4.2.2.2 Configuration
          3. 20.4.2.2.3 GPIO Mode
          4. 20.4.2.2.4 Input Buffer
          5. 20.4.2.2.5 Data Output Source
      3. 20.4.3 SMPH
        1. 20.4.3.1 Introduction
        2. 20.4.3.2 Functional Description
        3. 20.4.3.3 Semaphore Allocation in TI Software
      4. 20.4.4 SPIM
        1. 20.4.4.1 Introduction
        2. 20.4.4.2 Functional Description
          1. 20.4.4.2.1 TX and RX Operations
          2. 20.4.4.2.2 Configuration
          3. 20.4.4.2.3 Timing Diagrams
      5. 20.4.5 Time-to-Digital Converter (TDC)
        1. 20.4.5.1 Introduction
        2. 20.4.5.2 Functional Description
          1. 20.4.5.2.1 Command
          2. 20.4.5.2.2 Conversion Time Configuration
          3. 20.4.5.2.3 Status and Result
          4. 20.4.5.2.4 Clock Source Selection
            1. 20.4.5.2.4.1 Counter Clock
            2. 20.4.5.2.4.2 Reference Clock
          5. 20.4.5.2.5 Start and Stop Events
          6. 20.4.5.2.6 Prescaler
        3. 20.4.5.3 Supported Measurement Types
          1. 20.4.5.3.1 Measure Pulse Width
          2. 20.4.5.3.2 Measure Frequency
          3. 20.4.5.3.3 Measure Time Between Edges of Different Events Sources
            1. 20.4.5.3.3.1 Asynchronous Counter Start – Ignore 0 Stop Events
            2. 20.4.5.3.3.2 Synchronous Counter Start – Ignore 0 Stop Events
            3. 20.4.5.3.3.3 Asynchronous Counter Start – Ignore Stop Events
            4. 20.4.5.3.3.4 Synchronous Counter Start – Ignore Stop Events
          4. 20.4.5.3.4 Pulse Counting
      6. 20.4.6 Timer01
        1. 20.4.6.1 Introduction
        2. 20.4.6.2 Functional Description
      7. 20.4.7 Timer2
        1. 20.4.7.1 Introduction
        2. 20.4.7.2 Functional Description
          1. 20.4.7.2.1 Clock Source
          2. 20.4.7.2.2 Clock Prescaler
          3. 20.4.7.2.3 Counter
          4. 20.4.7.2.4 Event Outputs
          5. 20.4.7.2.5 Channel Actions
            1. 20.4.7.2.5.1 Period and Pulse Width Measurement
              1. 20.4.7.2.5.1.1 Timer Period and Pulse Width Capture
            2. 20.4.7.2.5.2 Clear on Zero, Toggle on Compare Repeatedly
              1. 20.4.7.2.5.2.1 Center-Aligned PWM Generation by Channel 0
            3. 20.4.7.2.5.3 Set on Zero, Toggle on Compare Repeatedly
              1. 20.4.7.2.5.3.1 Edge-Aligned PWM Generation by Channel 0
          6. 20.4.7.2.6 Asynchronous Bus Bridge
    5. 20.5 Analog Peripheral Modules
      1. 20.5.1 Overview
        1. 20.5.1.1 ADI Control-Configuration
        2. 20.5.1.2 Block Diagram
      2. 20.5.2 Analog-to-Digital Converter (ADC)
        1. 20.5.2.1 Introduction
        2. 20.5.2.2 Functional Description
          1. 20.5.2.2.1 Input Selection and Scaling
          2. 20.5.2.2.2 Reference Selection
          3. 20.5.2.2.3 ADC Sample Mode
          4. 20.5.2.2.4 ADC Clock Source
          5. 20.5.2.2.5 ADC Trigger
          6. 20.5.2.2.6 Sample FIFO
          7. 20.5.2.2.7 µDMA Interface
          8. 20.5.2.2.8 Resource Ownership and Usage
      3. 20.5.3 COMPA
        1. 20.5.3.1 Introduction
        2. 20.5.3.2 Functional Description
          1. 20.5.3.2.1 Input Selection
          2. 20.5.3.2.2 Reference Selection
          3. 20.5.3.2.3 LPM Bias and COMPA Enable
          4. 20.5.3.2.4 Resource Ownership and Usage
      4. 20.5.4 COMPB
        1. 20.5.4.1 Introduction
        2. 20.5.4.2 Functional Description
          1. 20.5.4.2.1 Input Selection
          2. 20.5.4.2.2 Reference Selection
          3. 20.5.4.2.3 Resource Ownership and Usage
            1. 20.5.4.2.3.1 Sensor Controller Wakeup
            2. 20.5.4.2.3.2 System CPU Wakeup
      5. 20.5.5 Reference DAC
        1. 20.5.5.1 Introduction
        2. 20.5.5.2 Functional Description
          1. 20.5.5.2.1 Reference Selection
          2. 20.5.5.2.2 Output Voltage Control and Range
          3. 20.5.5.2.3 Sample Clock
            1. 20.5.5.2.3.1 Automatic Phase Control
            2. 20.5.5.2.3.2 Manual Phase Control
            3. 20.5.5.2.3.3 Operational Mode Dependency
          4. 20.5.5.2.4 Output Selection
            1. 20.5.5.2.4.1 Buffer
            2. 20.5.5.2.4.2 External Load
            3. 20.5.5.2.4.3 COMPA_REF
            4. 20.5.5.2.4.4 COMPB_REF
          5. 20.5.5.2.5 LPM Bias
          6. 20.5.5.2.6 Resource Ownership and Usage
      6. 20.5.6 ISRC
        1. 20.5.6.1 Introduction
        2. 20.5.6.2 Functional Description
          1. 20.5.6.2.1 Programmable Current
          2. 20.5.6.2.2 Voltage Reference
          3. 20.5.6.2.3 ISRC Enable
          4. 20.5.6.2.4 Temperature Dependency
          5. 20.5.6.2.5 Resource Ownership and Usage
    6. 20.6 Event Routing and Usage
      1. 20.6.1 AUX Event Bus
        1. 20.6.1.1 Event Signals
        2. 20.6.1.2 Event Subscribers
          1. 20.6.1.2.1 Event Detection
            1. 20.6.1.2.1.1 Detection of Asynchronous Events
            2. 20.6.1.2.1.2 Detection of Synchronous Events
      2. 20.6.2 Event Observation on External Pin
      3. 20.6.3 Events From MCU Domain
      4. 20.6.4 Events to MCU Domain
      5. 20.6.5 Events From AON Domain
      6. 20.6.6 Events to AON Domain
      7. 20.6.7 µDMA Interface
    7. 20.7 Sensor Controller Alias Register Space
    8. 20.8 AUX Domain Sensor Controller and Peripherals Registers
      1. 20.8.1  ADI_4_AUX Registers
      2. 20.8.2  AUX_AIODIO Registers
      3. 20.8.3  AUX_EVCTL Registers
      4. 20.8.4  AUX_SMPH Registers
      5. 20.8.5  AUX_TDC Registers
      6. 20.8.6  AUX_TIMER01 Registers
      7. 20.8.7  AUX_TIMER2 Registers
      8. 20.8.8  AUX_ANAIF Registers
      9. 20.8.9  AUX_SYSIF Registers
      10. 20.8.10 AUX_SPIM Registers
      11. 20.8.11 AUX_MAC Registers
      12. 20.8.12 AUX_SCE Registers
  21. 21Battery Monitor and Temperature Sensor (BATMON)
    1. 21.1 Introduction
    2. 21.2 Functional Description
    3. 21.3 BATMON Registers
      1. 21.3.1 AON_BATMON Registers
  22. 22Universal Asynchronous Receiver/Transmitter (UART)
    1. 22.1 Introduction
    2. 22.2 Block Diagram
    3. 22.3 Signal Description
    4. 22.4 Functional Description
      1. 22.4.1 Transmit and Receive Logic
      2. 22.4.2 Baud-rate Generation
      3. 22.4.3 Data Transmission
      4. 22.4.4 Modem Handshake Support
        1. 22.4.4.1 Signaling
        2. 22.4.4.2 Flow Control
          1. 22.4.4.2.1 Hardware Flow Control (RTS and CTS)
          2. 22.4.4.2.2 Software Flow Control (Modem Status Interrupts)
      5. 22.4.5 FIFO Operation
      6. 22.4.6 Interrupts
      7. 22.4.7 Loopback Operation
    5. 22.5 Interface to DMA
    6. 22.6 Initialization and Configuration
    7. 22.7 UART Registers
      1. 22.7.1 UART Registers
  23. 23Synchronous Serial Interface (SSI)
    1. 23.1 Introduction
    2. 23.2 Block Diagram
    3. 23.3 Signal Description
    4. 23.4 Functional Description
      1. 23.4.1 Bit Rate Generation
      2. 23.4.2 FIFO Operation
        1. 23.4.2.1 Transmit FIFO
        2. 23.4.2.2 Receive FIFO
      3. 23.4.3 Interrupts
      4. 23.4.4 Frame Formats
        1. 23.4.4.1 Texas Instruments Synchronous Serial Frame Format
        2. 23.4.4.2 Motorola SPI Frame Format
          1. 23.4.4.2.1 SPO Clock Polarity Bit
          2. 23.4.4.2.2 SPH Phase-Control Bit
        3. 23.4.4.3 Motorola SPI Frame Format With SPO = 0 and SPH = 0
        4. 23.4.4.4 Motorola SPI Frame Format With SPO = 0 and SPH = 1
        5. 23.4.4.5 Motorola SPI Frame Format With SPO = 1 and SPH = 0
        6. 23.4.4.6 Motorola SPI Frame Format With SPO = 1 and SPH = 1
        7. 23.4.4.7 MICROWIRE Frame Format
    5. 23.5 DMA Operation
    6. 23.6 Initialization and Configuration
    7. 23.7 SSI Registers
      1. 23.7.1 SSI Registers
  24. 24Inter-Integrated Circuit (I2C)
    1. 24.1 Introduction
    2. 24.2 Block Diagram
    3. 24.3 Functional Description
      1. 24.3.1 I2C Bus Functional Overview
        1. 24.3.1.1 Start and Stop Conditions
        2. 24.3.1.2 Data Format With 7-Bit Address
        3. 24.3.1.3 Data Validity
        4. 24.3.1.4 Acknowledge
        5. 24.3.1.5 Arbitration
      2. 24.3.2 Available Speed Modes
        1. 24.3.2.1 Standard and Fast Modes
      3. 24.3.3 Interrupts
        1. 24.3.3.1 I2C Master Interrupts
        2. 24.3.3.2 I2C Slave Interrupts
      4. 24.3.4 Loopback Operation
      5. 24.3.5 Command Sequence Flow Charts
        1. 24.3.5.1 I2C Master Command Sequences
        2. 24.3.5.2 I2C Slave Command Sequences
    4. 24.4 Initialization and Configuration
    5. 24.5 I2C Registers
      1. 24.5.1 I2C Registers
  25. 25Inter-IC Sound (I2S)
    1. 25.1 Introduction
    2. 25.2 Block Diagram
    3. 25.3 Signal Description
    4. 25.4 Functional Description
      1. 25.4.1 Dependencies
        1. 25.4.1.1 System CPU Deep-Sleep Mode
      2. 25.4.2 Pin Configuration
      3. 25.4.3 Serial Format Configuration
      4. 25.4.4 I2S
        1. 25.4.4.1 Register Configuration
      5. 25.4.5 Left-Justified (LJF)
        1. 25.4.5.1 Register Configuration
      6. 25.4.6 Right-Justified (RJF)
        1. 25.4.6.1 Register Configuration
      7. 25.4.7 DSP
        1. 25.4.7.1 Register Configuration
      8. 25.4.8 Clock Configuration
        1. 25.4.8.1 Internal Audio Clock Source
        2. 25.4.8.2 External Audio Clock Source
    5. 25.5 Memory Interface
      1. 25.5.1 Sample Word Length
      2. 25.5.2 Channel Mapping
      3. 25.5.3 Sample Storage in Memory
      4. 25.5.4 DMA Operation
        1. 25.5.4.1 Start-Up
        2. 25.5.4.2 Operation
        3. 25.5.4.3 Shutdown
    6. 25.6 Samplestamp Generator
      1. 25.6.1 Samplestamp Counters
      2. 25.6.2 Start-Up Triggers
      3. 25.6.3 Samplestamp Capture
      4. 25.6.4 Achieving Constant Audio Latency
    7. 25.7 Error Detection
    8. 25.8 Usage
      1. 25.8.1 Start-Up Sequence
      2. 25.8.2 Shutdown Sequence
    9. 25.9 I2S Registers
      1. 25.9.1 I2S Registers
  26. 26Radio
    1. 26.1  RF Core
      1. 26.1.1 High-Level Description and Overview
    2. 26.2  Radio Doorbell
      1. 26.2.1 Special Boot Process
      2. 26.2.2 Command and Status Register and Events
      3. 26.2.3 RF Core Interrupts
        1. 26.2.3.1 RF Command and Packet Engine Interrupts
        2. 26.2.3.2 RF Core Hardware Interrupts
        3. 26.2.3.3 RF Core Command Acknowledge Interrupt
      4. 26.2.4 Radio Timer
        1. 26.2.4.1 Compare and Capture Events
        2. 26.2.4.2 Radio Timer Outputs
        3. 26.2.4.3 Synchronization With Real-Time Clock
    3. 26.3  RF Core HAL
      1. 26.3.1 Hardware Support
      2. 26.3.2 Firmware Support
        1. 26.3.2.1 Commands
        2. 26.3.2.2 Command Status
        3. 26.3.2.3 Interrupts
        4. 26.3.2.4 Passing Data
        5. 26.3.2.5 Command Scheduling
          1. 26.3.2.5.1 Triggers
          2. 26.3.2.5.2 Conditional Execution
          3. 26.3.2.5.3 Handling Before Start of Command
        6. 26.3.2.6 Command Data Structures
          1. 26.3.2.6.1 Radio Operation Command Structure
        7. 26.3.2.7 Data Entry Structures
          1. 26.3.2.7.1 Data Entry Queue
          2. 26.3.2.7.2 Data Entry
          3. 26.3.2.7.3 Pointer Entry
          4. 26.3.2.7.4 Partial Read RX Entry
        8. 26.3.2.8 External Signaling
      3. 26.3.3 Command Definitions
        1. 26.3.3.1 Protocol-Independent Radio Operation Commands
          1. 26.3.3.1.1  CMD_NOP: No Operation Command
          2. 26.3.3.1.2  CMD_RADIO_SETUP: Set Up Radio Settings Command
          3. 26.3.3.1.3  CMD_FS_POWERUP: Power Up Frequency Synthesizer
          4. 26.3.3.1.4  CMD_FS_POWERDOWN: Power Down Frequency Synthesizer
          5. 26.3.3.1.5  CMD_FS: Frequency Synthesizer Controls Command
          6. 26.3.3.1.6  CMD_FS_OFF: Turn Off Frequency Synthesizer
          7. 26.3.3.1.7  CMD_RX_TEST: Receiver Test Command
          8. 26.3.3.1.8  CMD_TX_TEST: Transmitter Test Command
          9. 26.3.3.1.9  CMD_SYNC_STOP_RAT: Synchronize and Stop Radio Timer Command
          10. 26.3.3.1.10 CMD_SYNC_START_RAT: Synchronously Start Radio Timer Command
          11. 26.3.3.1.11 CMD_COUNT: Counter Command
          12. 26.3.3.1.12 CMD_SCH_IMM: Run Immediate Command as Radio Operation
          13. 26.3.3.1.13 CMD_COUNT_BRANCH: Counter Command With Branch of Command Chain
          14. 26.3.3.1.14 CMD_PATTERN_CHECK: Check a Value in Memory Against a Pattern
        2. 26.3.3.2 Protocol-Independent Direct and Immediate Commands
          1. 26.3.3.2.1  CMD_ABORT: ABORT Command
          2. 26.3.3.2.2  CMD_STOP: Stop Command
          3. 26.3.3.2.3  CMD_GET_RSSI: Read RSSI Command
          4. 26.3.3.2.4  CMD_UPDATE_RADIO_SETUP: Update Radio Settings Command
          5. 26.3.3.2.5  CMD_TRIGGER: Generate Command Trigger
          6. 26.3.3.2.6  CMD_GET_FW_INFO: Request Information on the Firmware Being Run
          7. 26.3.3.2.7  CMD_START_RAT: Asynchronously Start Radio Timer Command
          8. 26.3.3.2.8  CMD_PING: Respond With Interrupt
          9. 26.3.3.2.9  CMD_READ_RFREG: Read RF Core Register
          10. 26.3.3.2.10 CMD_SET_RAT_CMP: Set RAT Channel to Compare Mode
          11. 26.3.3.2.11 CMD_SET_RAT_CPT: Set RAT Channel to Capture Mode
          12. 26.3.3.2.12 CMD_DISABLE_RAT_CH: Disable RAT Channel
          13. 26.3.3.2.13 CMD_SET_RAT_OUTPUT: Set RAT Output to a Specified Mode
          14. 26.3.3.2.14 CMD_ARM_RAT_CH: Arm RAT Channel
          15. 26.3.3.2.15 CMD_DISARM_RAT_CH: Disarm RAT Channel
          16. 26.3.3.2.16 CMD_SET_TX_POWER: Set Transmit Power
          17. 26.3.3.2.17 CMD_SET_TX20_POWER: Set Transmit Power of the 20 dBm PA
          18. 26.3.3.2.18 CMD_UPDATE_FS: Set New Synthesizer Frequency Without Recalibration (Depricated)
          19. 26.3.3.2.19 CMD_MODIFY_FS: Set New Synthesizer Frequency Without Recalibration
          20. 26.3.3.2.20 CMD_BUS_REQUEST: Request System BUS Available for RF Core
      4. 26.3.4 Immediate Commands for Data Queue Manipulation
        1. 26.3.4.1 CMD_ADD_DATA_ENTRY: Add Data Entry to Queue
        2. 26.3.4.2 CMD_REMOVE_DATA_ENTRY: Remove First Data Entry From Queue
        3. 26.3.4.3 CMD_FLUSH_QUEUE: Flush Queue
        4. 26.3.4.4 CMD_CLEAR_RX: Clear All RX Queue Entries
        5. 26.3.4.5 CMD_REMOVE_PENDING_ENTRIES: Remove Pending Entries From Queue
    4. 26.4  Data Queue Usage
      1. 26.4.1 Operations on Data Queues Available Only for Internal Radio CPU Operations
        1. 26.4.1.1 PROC_ALLOCATE_TX: Allocate TX Entry for Reading
        2. 26.4.1.2 PROC_FREE_DATA_ENTRY: Free Allocated Data Entry
        3. 26.4.1.3 PROC_FINISH_DATA_ENTRY: Finish Use of First Data Entry From Queue
        4. 26.4.1.4 PROC_ALLOCATE_RX: Allocate RX Buffer for Storing Data
        5. 26.4.1.5 PROC_FINISH_RX: Commit Received Data to RX Data Entry
      2. 26.4.2 Radio CPU Usage Model
        1. 26.4.2.1 Receive Queues
        2. 26.4.2.2 Transmit Queues
    5. 26.5  IEEE 802.15.4
      1. 26.5.1 IEEE 802.15.4 Commands
        1. 26.5.1.1 IEEE 802.15.4 Radio Operation Command Structures
        2. 26.5.1.2 IEEE 802.15.4 Immediate Command Structures
        3. 26.5.1.3 Output Structures
        4. 26.5.1.4 Other Structures and Bit Fields
      2. 26.5.2 Interrupts
      3. 26.5.3 Data Handling
        1. 26.5.3.1 Receive Buffers
        2. 26.5.3.2 Transmit Buffers
      4. 26.5.4 Radio Operation Commands
        1. 26.5.4.1 RX Operation
          1. 26.5.4.1.1 Frame Filtering and Source Matching
            1. 26.5.4.1.1.1 Frame Filtering
            2. 26.5.4.1.1.2 Source Matching
          2. 26.5.4.1.2 Frame Reception
          3. 26.5.4.1.3 ACK Transmission
          4. 26.5.4.1.4 End of Receive Operation
          5. 26.5.4.1.5 CCA Monitoring
        2. 26.5.4.2 Energy Detect Scan Operation
        3. 26.5.4.3 CSMA-CA Operation
        4. 26.5.4.4 Transmit Operation
        5. 26.5.4.5 Receive Acknowledgment Operation
        6. 26.5.4.6 Abort Background-Level Operation Command
      5. 26.5.5 Immediate Commands
        1. 26.5.5.1 Modify CCA Parameter Command
        2. 26.5.5.2 Modify Frame-Filtering Parameter Command
        3. 26.5.5.3 Enable or Disable Source Matching Entry Command
        4. 26.5.5.4 Abort Foreground-Level Operation Command
        5. 26.5.5.5 Stop Foreground-Level Operation Command
        6. 26.5.5.6 Request CCA and RSSI Information Command
    6. 26.6  Bluetooth® low energy
      1. 26.6.1 Bluetooth® low energy Commands
        1. 26.6.1.1 Command Data Definitions
          1. 26.6.1.1.1 Bluetooth® low energy Command Structures
        2. 26.6.1.2 Parameter Structures
        3. 26.6.1.3 Output Structures
        4. 26.6.1.4 Other Structures and Bit Fields
      2. 26.6.2 Interrupts
    7. 26.7  Data Handling
      1. 26.7.1 Receive Buffers
      2. 26.7.2 Transmit Buffers
    8. 26.8  Radio Operation Command Descriptions
      1. 26.8.1  Bluetooth® 5 Radio Setup Command
      2. 26.8.2  Radio Operation Commands for Bluetooth® low energy Packet Transfer
      3. 26.8.3  Coding Selection for Coded PHY
      4. 26.8.4  Parameter Override
      5. 26.8.5  Link Layer Connection
      6. 26.8.6  Slave Command
      7. 26.8.7  Master Command
      8. 26.8.8  Legacy Advertiser
        1. 26.8.8.1 Connectable Undirected Advertiser Command
        2. 26.8.8.2 Connectable Directed Advertiser Command
        3. 26.8.8.3 Nonconnectable Advertiser Command
        4. 26.8.8.4 Scannable Undirected Advertiser Command
      9. 26.8.9  Bluetooth® 5 Advertiser Commands
        1. 26.8.9.1 Common Extended Advertising Packets
        2. 26.8.9.2 Extended Advertiser Command
        3. 26.8.9.3 Secondary Channel Advertiser Command
      10. 26.8.10 Scanner Commands
        1. 26.8.10.1 Scanner Receiving Legacy Advertising Packets on Primary Channel
        2. 26.8.10.2 Scanner Receiving Extended Advertising Packets on Primary Channel
        3. 26.8.10.3 Scanner Receiving Extended Advertising Packets on Secondary Channel
        4. 26.8.10.4 ADI Filtering
        5. 26.8.10.5 End of Scanner Commands
      11. 26.8.11 Initiator Command
        1. 26.8.11.1 Initiator Receiving Legacy Advertising Packets on Primary Channel
        2. 26.8.11.2 Initiator Receiving Extended Advertising Packets on Primary Channel
        3. 26.8.11.3 Initiator Receiving Extended Advertising Packets on Secondary Channel
        4. 26.8.11.4 Automatic Window Offset Insertion
        5. 26.8.11.5 End of Initiator Commands
      12. 26.8.12 Generic Receiver Command
      13. 26.8.13 PHY Test Transmit Command
      14. 26.8.14 Whitelist Processing
      15. 26.8.15 Backoff Procedure
      16. 26.8.16 AUX Pointer Processing
      17. 26.8.17 Dynamic Change of Device Address
    9. 26.9  Immediate Commands
      1. 26.9.1 Update Advertising Payload Command
    10. 26.10 Proprietary Radio
      1. 26.10.1 Packet Formats
      2. 26.10.2 Commands
        1. 26.10.2.1 Command Data Definitions
          1. 26.10.2.1.1 Command Structures
        2. 26.10.2.2 Output Structures
        3. 26.10.2.3 Other Structures and Bit Fields
      3. 26.10.3 Interrupts
      4. 26.10.4 Data Handling
        1. 26.10.4.1 Receive Buffers
        2. 26.10.4.2 Transmit Buffers
      5. 26.10.5 Radio Operation Command Descriptions
        1. 26.10.5.1 End of Operation
        2. 26.10.5.2 Proprietary Mode Setup Command
          1. 26.10.5.2.1 IEEE 802.15.4g Packet Format
        3. 26.10.5.3 Transmitter Commands
          1. 26.10.5.3.1 Standard Transmit Command, CMD_PROP_TX
          2. 26.10.5.3.2 Advanced Transmit Command, CMD_PROP_TX_ADV
        4. 26.10.5.4 Receiver Commands
          1. 26.10.5.4.1 Standard Receive Command, CMD_PROP_RX
          2. 26.10.5.4.2 Advanced Receive Command, CMD_PROP_RX_ADV
        5. 26.10.5.5 Carrier-Sense Operation
          1. 26.10.5.5.1 Common Carrier-Sense Description
          2. 26.10.5.5.2 Carrier-Sense Command, CMD_PROP_CS
          3. 26.10.5.5.3 Sniff Mode Receiver Commands, CMD_PROP_RX_SNIFF and CMD_PROP_RX_ADV_SNIFF
      6. 26.10.6 Immediate Commands
        1. 26.10.6.1 Set Packet Length Command, CMD_PROP_SET_LEN
        2. 26.10.6.2 Restart Packet RX Command, CMD_PROP_RESTART_RX
    11. 26.11 Radio Registers
      1. 26.11.1 RFC_RAT Registers
      2. 26.11.2 RFC_DBELL Registers
      3. 26.11.3 RFC_PWR Registers
  27. 27Revision History

24.5.1 I2C Registers

Table 24-2 lists the memory-mapped registers for the I2C registers. All register offset addresses not listed in Table 24-2 should be considered as reserved locations and the register contents should not be modified.

Table 24-2 I2C Registers
OffsetAcronymRegister NameSection
0hSOARSlave Own AddressSOAR Register (Offset = 0h) [Reset = 00000000h]
4hSSTATSlave StatusSSTAT Register (Offset = 4h) [Reset = 00000000h]
4hSCTLSlave ControlSCTL Register (Offset = 4h) [Reset = 00000000h]
8hSDRSlave DataSDR Register (Offset = 8h) [Reset = 00000000h]
ChSIMRSlave Interrupt MaskSIMR Register (Offset = Ch) [Reset = 00000000h]
10hSRISSlave Raw Interrupt StatusSRIS Register (Offset = 10h) [Reset = 00000000h]
14hSMISSlave Masked Interrupt StatusSMIS Register (Offset = 14h) [Reset = 00000000h]
18hSICRSlave Interrupt ClearSICR Register (Offset = 18h) [Reset = 00000000h]
800hMSAMaster Salve AddressMSA Register (Offset = 800h) [Reset = 00000000h]
804hMSTATMaster StatusMSTAT Register (Offset = 804h) [Reset = 00000020h]
804hMCTRLMaster ControlMCTRL Register (Offset = 804h) [Reset = 00000000h]
808hMDRMaster DataMDR Register (Offset = 808h) [Reset = 00000000h]
80ChMTPRI2C Master Timer PeriodMTPR Register (Offset = 80Ch) [Reset = 00000001h]
810hMIMRMaster Interrupt MaskMIMR Register (Offset = 810h) [Reset = 00000000h]
814hMRISMaster Raw Interrupt StatusMRIS Register (Offset = 814h) [Reset = 00000000h]
818hMMISMaster Masked Interrupt StatusMMIS Register (Offset = 818h) [Reset = 00000000h]
81ChMICRMaster Interrupt ClearMICR Register (Offset = 81Ch) [Reset = 00000000h]
820hMCRMaster ConfigurationMCR Register (Offset = 820h) [Reset = 00000000h]

Complex bit access types are encoded to fit into small table cells. Table 24-3 shows the codes that are used for access types in this section.

Table 24-3 I2C Access Type Codes
Access TypeCodeDescription
Read Type
RRRead
Write Type
WWWrite
Reset or Default Value
-nValue after reset or the default value

24.5.1.1 SOAR Register (Offset = 0h) [Reset = 00000000h]

SOAR is shown in Figure 24-14 and described in Table 24-4.

Return to the Summary Table.

Slave Own Address
This register consists of seven address bits that identify this I2C device on the I2C bus.

Figure 24-14 SOAR Register
313029282726252423222120191817161514131211109876543210
RESERVEDOAR
R-0hR/W-0h
Table 24-4 SOAR Register Field Descriptions
BitFieldTypeResetDescription
31-7RESERVEDR0hReserved
6-0OARR/W0hI2C slave own address
This field specifies bits a6 through a0 of the slave address.

24.5.1.2 SSTAT Register (Offset = 4h) [Reset = 00000000h]

SSTAT is shown in Figure 24-15 and described in Table 24-5.

Return to the Summary Table.

Slave Status
Note: This register shares address with SCTL, meaning that this register functions as a control register when written, and a status register when read.

Figure 24-15 SSTAT Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDFBRTREQRREQ
R-0hR-0hR-0hR-0h
Table 24-5 SSTAT Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2FBRR0hFirst byte received
0: The first byte has not been received.
1: The first byte following the slave's own address has been received.
This bit is only valid when the RREQ bit is set and is automatically cleared when data has been read from the SDR register.
Note: This bit is not used for slave transmit operations.
1TREQR0hTransmit request
0: No outstanding transmit request.
1: The I2C controller has been addressed as a slave transmitter and is using clock stretching to delay the master until data has been written to the SDR register.
0RREQR0hReceive request
0: No outstanding receive data
1: The I2C controller has outstanding receive data from the I2C master and is using clock stretching to delay the master until data has been read from the SDR register.

24.5.1.3 SCTL Register (Offset = 4h) [Reset = 00000000h]

SCTL is shown in Figure 24-16 and described in Table 24-6.

Return to the Summary Table.

Slave Control
Note: This register shares address with SSTAT, meaning that this register functions as a control register when written, and a status register when read.

Figure 24-16 SCTL Register
31302928272625242322212019181716
RESERVED
W-0h
1514131211109876543210
RESERVEDDA
W-0hW-0h
Table 24-6 SCTL Register Field Descriptions
BitFieldTypeResetDescription
31-1RESERVEDW0hSoftware should not rely on the value of a reserved field. Writing any other value may result in undefined behavior.
0DAW0hDevice active
0: Disables the I2C slave operation
1: Enables the I2C slave operation

24.5.1.4 SDR Register (Offset = 8h) [Reset = 00000000h]

SDR is shown in Figure 24-17 and described in Table 24-7.

Return to the Summary Table.

Slave Data
This register contains the data to be transmitted when in the Slave Transmit state, and the data received when in the Slave Receive state.

Figure 24-17 SDR Register
313029282726252423222120191817161514131211109876543210
RESERVEDDATA
R-0hR/W-0h
Table 24-7 SDR Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7-0DATAR/W0hData for transfer
This field contains the data for transfer during a slave receive or transmit operation. When written the register data is used as transmit data. When read, this register returns the last data received.
Data is stored until next update, either by a system write for transmit or by an external master for receive.

24.5.1.5 SIMR Register (Offset = Ch) [Reset = 00000000h]

SIMR is shown in Figure 24-18 and described in Table 24-8.

Return to the Summary Table.

Slave Interrupt Mask
This register controls whether a raw interrupt is promoted to a controller interrupt.

Figure 24-18 SIMR Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDSTOPIMSTARTIMDATAIM
R-0hR/W-0hR/W-0hR/W-0h
Table 24-8 SIMR Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2STOPIMR/W0hStop condition interrupt mask
0: The SRIS.STOPRIS interrupt is suppressed and not sent to the interrupt controller.
1: The SRIS.STOPRIS interrupt is enabled and sent to the interrupt controller.
0h = Disable Interrupt
1h = Enable Interrupt
1STARTIMR/W0hStart condition interrupt mask
0: The SRIS.STARTRIS interrupt is suppressed and not sent to the interrupt controller.
1: The SRIS.STARTRIS interrupt is enabled and sent to the interrupt controller.
0h = Disable Interrupt
1h = Enable Interrupt
0DATAIMR/W0hData interrupt mask
0: The SRIS.DATARIS interrupt is suppressed and not sent to the interrupt controller.
1: The SRIS.DATARIS interrupt is enabled and sent to the interrupt controller.

24.5.1.6 SRIS Register (Offset = 10h) [Reset = 00000000h]

SRIS is shown in Figure 24-19 and described in Table 24-9.

Return to the Summary Table.

Slave Raw Interrupt Status
This register shows the unmasked interrupt status.

Figure 24-19 SRIS Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDSTOPRISSTARTRISDATARIS
R-0hR-0hR-0hR-0h
Table 24-9 SRIS Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2STOPRISR0hStop condition raw interrupt status
0: No interrupt
1: A Stop condition interrupt is pending.
This bit is cleared by writing a 1 to SICR.STOPIC.
1STARTRISR0hStart condition raw interrupt status
0: No interrupt
1: A Start condition interrupt is pending.
This bit is cleared by writing a 1 to SICR.STARTIC.
0DATARISR0hData raw interrupt status
0: No interrupt
1: A data received or data requested interrupt is pending.
This bit is cleared by writing a 1 to the SICR.DATAIC.

24.5.1.7 SMIS Register (Offset = 14h) [Reset = 00000000h]

SMIS is shown in Figure 24-20 and described in Table 24-10.

Return to the Summary Table.

Slave Masked Interrupt Status
This register show which interrupt is active (based on result from SRIS and SIMR).

Figure 24-20 SMIS Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDSTOPMISSTARTMISDATAMIS
R-0hR-0hR-0hR-0h
Table 24-10 SMIS Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2STOPMISR0hStop condition masked interrupt status
0: An interrupt has not occurred or is masked/disabled.
1: An unmasked Stop condition interrupt is pending.
This bit is cleared by writing a 1 to the SICR.STOPIC.
1STARTMISR0hStart condition masked interrupt status
0: An interrupt has not occurred or is masked/disabled.
1: An unmasked Start condition interrupt is pending.
This bit is cleared by writing a 1 to the SICR.STARTIC.
0DATAMISR0hData masked interrupt status
0: An interrupt has not occurred or is masked/disabled.
1: An unmasked data received or data requested interrupt is pending.
This bit is cleared by writing a 1 to the SICR.DATAIC.

24.5.1.8 SICR Register (Offset = 18h) [Reset = 00000000h]

SICR is shown in Figure 24-21 and described in Table 24-11.

Return to the Summary Table.

Slave Interrupt Clear
This register clears the raw interrupt SRIS.

Figure 24-21 SICR Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDSTOPICSTARTICDATAIC
R-0hW-0hW-0hW-0h
Table 24-11 SICR Register Field Descriptions
BitFieldTypeResetDescription
31-3RESERVEDR0hReserved
2STOPICW0hStop condition interrupt clear
Writing 1 to this bit clears SRIS.STOPRIS and SMIS.STOPMIS.
1STARTICW0hStart condition interrupt clear
Writing 1 to this bit clears SRIS.STARTRIS SMIS.STARTMIS.
0DATAICW0hData interrupt clear
Writing 1 to this bit clears SRIS.DATARIS SMIS.DATAMIS.

24.5.1.9 MSA Register (Offset = 800h) [Reset = 00000000h]

MSA is shown in Figure 24-22 and described in Table 24-12.

Return to the Summary Table.

Master Salve Address
This register contains seven address bits of the slave to be accessed by the master (a6-a0), and an RS bit determining if the next operation is a receive or transmit.

Figure 24-22 MSA Register
31302928272625242322212019181716
RESERVED
R-0h
1514131211109876543210
RESERVEDSARS
R-0hR/W-0hR/W-0h
Table 24-12 MSA Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7-1SAR/W0hI2C master slave address
Defines which slave is addressed for the transaction in master mode
0RSR/W0hReceive or Send
This bit-field specifies if the next operation is a receive (high) or a transmit/send (low) from the addressed slave SA.
0h = Transmit/send data to slave
1h = Receive data from slave

24.5.1.10 MSTAT Register (Offset = 804h) [Reset = 00000020h]

MSTAT is shown in Figure 24-23 and described in Table 24-13.

Return to the Summary Table.

Master Status

Figure 24-23 MSTAT Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDBUSBSYIDLEARBLSTDATACK_NADRACK_NERRBUSY
R-0hR-0hR-1hR-0hR-0hR-0hR-0hR-0h
Table 24-13 MSTAT Register Field Descriptions
BitFieldTypeResetDescription
31-7RESERVEDR0hReserved
6BUSBSYR0hBus busy
0: The I2C bus is idle.
1: The I2C bus is busy.
The bit changes based on the MCTRL.START and MCTRL.STOP conditions.
5IDLER1hI2C idle
0: The I2C controller is not idle.
1: The I2C controller is idle.
4ARBLSTR0hArbitration lost
0: The I2C controller won arbitration.
1: The I2C controller lost arbitration.
3DATACK_NR0hData Was Not Acknowledge
0: The transmitted data was acknowledged.
1: The transmitted data was not acknowledged.
2ADRACK_NR0hAddress Was Not Acknowledge
0: The transmitted address was acknowledged.
1: The transmitted address was not acknowledged.
1ERRR0hError
0: No error was detected on the last operation.
1: An error occurred on the last operation.
0BUSYR0hI2C busy
0: The controller is idle.
1: The controller is busy.
When this bit-field is set, the other status bits are not valid.
Note: The I2C controller requires four SYSBUS clock cycles to assert the BUSY status after I2C master operation has been initiated through MCTRL register.
Hence after programming MCTRL register, application is requested to wait for four SYSBUS clock cycles before issuing a controller status inquiry through MSTAT register.
Any prior inquiry would result in wrong status being reported.

24.5.1.11 MCTRL Register (Offset = 804h) [Reset = 00000000h]

MCTRL is shown in Figure 24-24 and described in Table 24-14.

Return to the Summary Table.

Master Control
This register accesses status bits when read and control bits when written. When read, the status register indicates the state of the I2C bus controller as stated in MSTAT. When written, the control register configures the I2C controller operation.
To generate a single transmit cycle, the I2C Master Slave Address (MSA) register is written with the desired address, the MSA.RS bit is cleared, and this register is written with
* ACK=X (0 or 1),
* STOP=1,
* START=1,
* RUN=1
to perform the operation and stop.
When the operation is completed (or aborted due an error), an interrupt becomes active and the data may be read from the MDR register.

Figure 24-24 MCTRL Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDACKSTOPSTARTRUN
R-0hW-0hW-0hW-0hW-0h
Table 24-14 MCTRL Register Field Descriptions
BitFieldTypeResetDescription
31-4RESERVEDR0hReserved
3ACKW0hData acknowledge enable
0: The received data byte is not acknowledged automatically by the master.
1: The received data byte is acknowledged automatically by the master.
This bit-field must be cleared when the I2C bus controller requires no further data to be transmitted from the slave transmitter.
0h = Disable acknowledge
1h = Enable acknowledge
2STOPW0hThis bit-field determines if the cycle stops at the end of the data cycle or continues on to a repeated START condition.
0: The controller does not generate the Stop condition.
1: The controller generates the Stop condition.
0h = Disable STOP
1h = Enable STOP
1STARTW0hThis bit-field generates the Start or Repeated Start condition.
0: The controller does not generate the Start condition.
1: The controller generates the Start condition.
0h = Disable START
1h = Enable START
0RUNW0hI2C master enable
0: The master is disabled.
1: The master is enabled to transmit or receive data.
0h = Disable Master
1h = Enable Master

24.5.1.12 MDR Register (Offset = 808h) [Reset = 00000000h]

MDR is shown in Figure 24-25 and described in Table 24-15.

Return to the Summary Table.

Master Data
This register contains the data to be transmitted when in the Master Transmit state and the data received when in the Master Receive state.

Figure 24-25 MDR Register
313029282726252423222120191817161514131211109876543210
RESERVEDDATA
R-0hR/W-0h
Table 24-15 MDR Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7-0DATAR/W0hWhen Read: Last RX Data is returned
When Written: Data is transferred during TX transaction

24.5.1.13 MTPR Register (Offset = 80Ch) [Reset = 00000001h]

MTPR is shown in Figure 24-26 and described in Table 24-16.

Return to the Summary Table.

I2C Master Timer Period
This register specifies the period of the SCL clock.

Figure 24-26 MTPR Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
TPR_7TPR
R/W-0hR/W-1h
Table 24-16 MTPR Register Field Descriptions
BitFieldTypeResetDescription
31-8RESERVEDR0hReserved
7TPR_7R/W0hMust be set to 0 to set TPR. If set to 1, a write to TPR will be ignored.
6-0TPRR/W1hSCL clock period
This field specifies the period of the SCL clock.
SCL_PRD = 2*(1+TPR)*(SCL_LP + SCL_HP)*CLK_PRD
where:
SCL_PRD is the SCL line period (I2C clock).
TPR is the timer period register value (range of 1 to 127)
SCL_LP is the SCL low period (fixed at 6).
SCL_HP is the SCL high period (fixed at 4).
CLK_PRD is the system clock period in ns.

24.5.1.14 MIMR Register (Offset = 810h) [Reset = 00000000h]

MIMR is shown in Figure 24-27 and described in Table 24-17.

Return to the Summary Table.

Master Interrupt Mask
This register controls whether a raw interrupt is promoted to a controller interrupt.

Figure 24-27 MIMR Register
31302928272625242322212019181716
RESERVED
R-0h
1514131211109876543210
RESERVEDIM
R-0hR/W-0h
Table 24-17 MIMR Register Field Descriptions
BitFieldTypeResetDescription
31-1RESERVEDR0hReserved
0IMR/W0hInterrupt mask
0: The MRIS.RIS interrupt is suppressed and not sent to the interrupt controller.
1: The master interrupt is sent to the interrupt controller when the MRIS.RIS is set.
0h = Disable Interrupt
1h = Enable Interrupt

24.5.1.15 MRIS Register (Offset = 814h) [Reset = 00000000h]

MRIS is shown in Figure 24-28 and described in Table 24-18.

Return to the Summary Table.

Master Raw Interrupt Status
This register show the unmasked interrupt status.

Figure 24-28 MRIS Register
31302928272625242322212019181716
RESERVED
R-0h
1514131211109876543210
RESERVEDRIS
R-0hR-0h
Table 24-18 MRIS Register Field Descriptions
BitFieldTypeResetDescription
31-1RESERVEDR0hReserved
0RISR0hRaw interrupt status
0: No interrupt
1: A master interrupt is pending.
This bit is cleared by writing 1 to the MICR.IC bit .

24.5.1.16 MMIS Register (Offset = 818h) [Reset = 00000000h]

MMIS is shown in Figure 24-29 and described in Table 24-19.

Return to the Summary Table.

Master Masked Interrupt Status
This register show which interrupt is active (based on result from MRIS and MIMR).

Figure 24-29 MMIS Register
31302928272625242322212019181716
RESERVED
R-0h
1514131211109876543210
RESERVEDMIS
R-0hR-0h
Table 24-19 MMIS Register Field Descriptions
BitFieldTypeResetDescription
31-1RESERVEDR0hReserved
0MISR0hMasked interrupt status
0: An interrupt has not occurred or is masked.
1: A master interrupt is pending.
This bit is cleared by writing 1 to the MICR.IC bit .

24.5.1.17 MICR Register (Offset = 81Ch) [Reset = 00000000h]

MICR is shown in Figure 24-30 and described in Table 24-20.

Return to the Summary Table.

Master Interrupt Clear
This register clears the raw and masked interrupt.

Figure 24-30 MICR Register
31302928272625242322212019181716
RESERVED
R-0h
1514131211109876543210
RESERVEDIC
R-0hW-0h
Table 24-20 MICR Register Field Descriptions
BitFieldTypeResetDescription
31-1RESERVEDR0hReserved
0ICW0hInterrupt clear
Writing 1 to this bit clears MRIS.RIS and MMIS.MIS .
Reading this register returns no meaningful data.

24.5.1.18 MCR Register (Offset = 820h) [Reset = 00000000h]

MCR is shown in Figure 24-31 and described in Table 24-21.

Return to the Summary Table.

Master Configuration
This register configures the mode (Master or Slave) and sets the interface for test mode loopback.

Figure 24-31 MCR Register
3130292827262524
RESERVED
R-0h
2322212019181716
RESERVED
R-0h
15141312111098
RESERVED
R-0h
76543210
RESERVEDSFEMFERESERVEDLPBK
R-0hR/W-0hR/W-0hR-0hR/W-0h
Table 24-21 MCR Register Field Descriptions
BitFieldTypeResetDescription
31-6RESERVEDR0hReserved
5SFER/W0hI2C slave function enable
0h = Slave mode is disabled.
1h = Slave mode is enabled.
4MFER/W0hI2C master function enable
0h = Master mode is disabled.
1h = Master mode is enabled.
3-1RESERVEDR0hReserved
0LPBKR/W0hI2C loopback
0: Normal operation
1: Loopback operation (test mode)
0h = Disable Test Mode
1h = Enable Test Mode