SLAU319AF July   2010  – September 2022

 

  1.   Abstract - MSP430™ Flash Devices Bootloader (BSL)
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Supplementary Online Information
    2. 1.2 Overview of BSL Features
    3. 1.3 BSL Invocation
      1. 1.3.1 Hardware BSL Invocation
        1. 1.3.1.1 MSP430 Devices With Shared JTAG Pins
          1. 1.3.1.1.1 Factors That Prevent BSL Invocation With Shared JTAG Pins
        2. 1.3.1.2 MSP430 Flash Devices With Dedicated JTAG Pins
          1. 1.3.1.2.1 Factors That Prevent BSL Invocation With Dedicated JTAG Pins
        3. 1.3.1.3 Devices With USB
      2. 1.3.2 Software BSL Invocation
    4. 1.4 UART Protocol
    5. 1.5 USB Protocol
  4. 2Bootloader Protocol – 1xx, 2xx, and 4xx Families
    1. 2.1 Synchronization Sequence
    2. 2.2 Commands
      1. 2.2.1 Unprotected Commands
      2. 2.2.2 Password Protected Commands
    3. 2.3 Programming Flow
    4. 2.4 Data Frame
      1. 2.4.1 Data-Stream Structure
      2. 2.4.2 Checksum
      3. 2.4.3 Example Sequence
      4. 2.4.4 Commands – Detailed Description
        1. 2.4.4.1  General
        2. 2.4.4.2  RX Data Block
        3. 2.4.4.3  RX Password
        4. 2.4.4.4  Mass Erase
        5. 2.4.4.5  Erase Segment
        6. 2.4.4.6  Erase Main or Info
        7. 2.4.4.7  Erase Check
        8. 2.4.4.8  Change Baud Rate
        9. 2.4.4.9  Set Memory Offset
        10. 2.4.4.10 Load PC
        11. 2.4.4.11 TX Data Block
        12. 2.4.4.12 TX BSL Version
    5. 2.5 Loadable BSL
    6. 2.6 Exiting the BSL
    7. 2.7 Password Protection
    8. 2.8 Code Protection Fuse
    9. 2.9 BSL Internal Settings and Resources
      1. 2.9.1 Chip Identification and BSL Version
      2. 2.9.2 Vectors to Call the BSL Externally
      3. 2.9.3 Initialization Status
      4. 2.9.4 Memory Allocation and Resources
  5. 3Bootloader Protocol – F5xx and F6xx Families
    1. 3.1 BSL Data Packet
    2. 3.2 UART Peripheral Interface (PI)
      1. 3.2.1 Wrapper
      2. 3.2.2 Abbreviations
      3. 3.2.3 Messages
      4. 3.2.4 Interface Specific Commands
        1. 3.2.4.1 Change Baud Rate
    3. 3.3 I2C Peripheral Interface
      1. 3.3.1 I2C Protocol Definition
      2. 3.3.2 Basic Protocol With Byte Level Acknowledge
      3. 3.3.3 I2C Protocol for BSL - Read From Slave
      4. 3.3.4 Acknowledge (ACK)
      5. 3.3.5 Wrapper
    4. 3.4 USB Peripheral Interface
      1. 3.4.1 Wrapper
      2. 3.4.2 Hardware Requirements
    5. 3.5 BSL Core Command Structure
      1. 3.5.1 Abbreviations
      2. 3.5.2 Command Descriptions
    6. 3.6 BSL Security
      1. 3.6.1 Protected Commands
      2. 3.6.2 RAM Erase
    7. 3.7 BSL Core Responses
      1. 3.7.1 Abbreviations
      2. 3.7.2 BSL Core Messages
      3. 3.7.3 BSL Version Number
      4. 3.7.4 Example Sequences for UART BSL
    8. 3.8 BSL Public Functions and Z-Area
      1. 3.8.1 Starting the BSL From an External Application
      2. 3.8.2 Return to BSL Function Description
  6. 4Bootloader Hardware
    1. 4.1 Hardware Description
      1. 4.1.1 Power Supply
      2. 4.1.2 Serial Interface
        1. 4.1.2.1 Level Shifting
        2. 4.1.2.2 Control of RST/NMI and TEST or TCK Pins
      3. 4.1.3 Target Connector
      4. 4.1.4 Parts List
  7. 5Differences Between Devices and Bootloader Versions
    1. 5.1 1xx, 2xx, and 4xx BSL Versions
    2. 5.2 Special Consideration for ROM BSL Version 1.10
    3. 5.3 1xx, 2xx, and 4xx BSL Known Issues
    4. 5.4 Special Note on the MSP430F14x Device Family BSL
    5. 5.5 F5xx and F6xx Flash-Based BSL Versions
  8. 6Bootloader PCB Layout Suggestion
  9. 7Revision History

2.4.4.8 Change Baud Rate

The change baud rate command offers the capability of transmissions at higher baud rates than the default 9600 baud. With faster data transition, shorter programming cycles can be achieved, which is especially important with large flash memory devices. This command is not password protected.

Three control bytes (D1 to D3) determine the selected baud rate. D1 and D2 set the processor frequency (f ≥ fmin), D3 indirectly sets the flash timing generator frequency (fFTGmin ≤ fFTG ≤ fFTGmax). In detail:

D1: F1xx: Basic clock module control register DCOCTL (DCO.2 to DCO.0)
F2xx: Basic clock module control register DCOCTL (DCO.2 to DCO.0)
F4xx: FLL+ system clock control register SCFI0 (D, FN_8 to FN_2)
D2: F1xx: basic clock module control register BCSCTL1 (XT2Off, Rsel.2 to Rsel.0)
F2xx: basic clock module control register BCSCTL1 (XT2Off, Rsel.2 to Rsel.0)
F4xx: FLL+ system clock control register SCFI1 (NDCO)
D3 0: 9600 baud
1: 19200 baud
2: 38400 baud

After receiving the data frame, an acknowledge character DATA_ACK is sent back, and the BSL becomes prepared for the selected baud rate. TI recommends that the BSL communication program wait approximately 10 ms between baud rate alteration and the next data transmission to give the BSL clock system time to stabilize.

Note:

The highest achievable baud rate depends on various system and environment parameters like supply voltage, temperature range, and minimum and maximum processor frequency. See the device-specific data sheet.

Note:

This command is implemented on BSL versions V1.60 or higher or available in the loadable bootloader BL_150S_14x.txt.

Table 2-2 Recommendations for MSP430F149 [MSP430F449] (1) TA = 25°C, VCC = 3.0 V, fmax = 6.7 MHz
Baud Rate
(baud)		 Processor Frequency, fmin
(MHz)(4)		 D1 DCOCTL
[SCFI0](2)		 D2 BCSCTL1
[SCFI1](2)		 D3(2) Program and Verify 60 KB
(sec)(3)
9600 (init) 1.05 0x80 [00] 0x85 [98] 00 [00] 78 + 3.7 [0.0]
19200 2.1 0xE0 [00] 0x86 [B0] 01 [01] 39 + 3.7 [2.4]
38400 4.2 0xE0 [00] 0x87 [C8] 02 [02] 20 + 3.7 [2.4]
(1) Values in brackets [ ] apply to MSP430F449.
(2) D1 to D3 are bytes in hexadecimal notation.
(3) Additional 3.7 [2.4] seconds result from loading, verifying, and launching the loadable BSL.
(4) The minimum processor frequency is lower than in the standard ROM BSL (see Initialization Status).
Table 2-3 Recommendations for MSP430F2131 TA = 25°C, VCC = 3.0 V, fmax = 6.7 MHz
Baud Rate
(baud)		 Processor Frequency, fmin
(MHz)(2)		 D1 DCOCTL
[SCFI0](1)		 D2 BCSCTL1
[SCFI1](1)		 D3(1) Program and Verify 60 KB
(sec)
9600 (init) 1.05 0x80 0x85 00 78
19200 2.1 0x00 0x8B 01 39
38400 4.2 0x80 0x8C 02 20
(1) D1 to D3 are bytes in hexadecimal notation.
(2) The minimum processor frequency is lower than in the standard ROM BSL (see Initialization Status).