## Legend of abbreviations and signals

Abbreviation/Signal | Type | Description
AAF | Short | Anti Aliasing Filter
ACLK_REF | Short | Reference clock from OSC_TOP to AUX. Source is selectable. This clock signal can be used as an event in AUX
AD0 | Short | Audio Data line 0
AD1 | Short | Audio Data line 1
AD2 | Short | Audio Data line 2
ADC | Short | Analog to Digital Converter
ADCREF | Short | ADC reference voltage
ADC_DMA | Short | DMA trigger from the ADC, triggering DMA channel #7
ADC_DONE | Short | ADC conversion done event available in AUX
ADC_FIFO_ALMOST_FULL | Short | Event in AUX signaling that there is only room for one more sample in the ADC FIFO
ADC_IRQ | Short | Event from ADC/ADC_FIFO to MCU domain. For details see user guide
ADI | Module | Analog to Digital Interface
AGC | Module | Automatic Gain Control
AHB | Short | AMBA High-speed Bus
AIF | Short | Audio Inter Face
AIODIO0 | Short | Module controlling pins assigned to AUX
AIODIO1 | Short | Module controlling pins assigned to AUX
AMPCOMP | Short | Amplitude Compensation
AON | Short | Voltage domain that is Always On
AON_EVENT | Module | Always on Event routing
AON_IOC | Module | Always ON IOC
AON_PROG_WU | Short | Wake up event from AON to AUX. Up to three programmable sources OR'ed together to generate this event
AON_RTC | Module | Always ON Real Time Clock
AON_RTC_CH2 | Short | Event from the AON_RTC channel 2
AON_SPISLAVE | Module | Always on part of SPI Slave module
AON_SW | Short | SW triggered event from AON to AUX
AON_WUC | Module | Always ON WakeUp Control
ARM | Short | Advanced RISC Machines, Company
ATDATA1 | Signal | Trace data bus for in ATB interface port 1. Connects to ETM when ETM is present. Connects to ITM when ETM does not exist.
ATDATA2 | Signal | Trace data bus for in ATB interface port 2. Connects to ITM when ETM is present. Tied-off when ETM does not exist.
ATEST | Short | Analog Test
ATEST0 | Short | Analog test signal/bus
ATEST1 | Short | Analog test signal/bus
ATEST_OSCHF_ANA_OUT | Signal | Internal Signal
ATEST_OSCHF_CLCKOUT_1P8V | Signal | Internal Signal
ATEST_OSCHF_CLKOUT_1P8V | Signal | Internal Signal
AUX | Module | Auxiliary
AUXIO0 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO1 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO10 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO11 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO12 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO13 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO14 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO15 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO2 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO3 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO4 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO5 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO6 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO7 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO8 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUXIO9 | Short | Analog/Digital General Purpose Input Output pin that can be mapped to AUX. For details see IOC
AUX_AIODIO0 | Short | Module controlling pins assigned to AUX
AUX_AIODIO1 | Short | Module controlling pins assigned to AUX
AUX_COMB | Short | Combined event from AUX to MCU domain. See user guide for details
AUX_COMPA | Short | Comparator A. Analog peripheral of AUX. In AUX this can also refer to the event coming from this comparator
AUX_COMPB | Short | Comparator B. Analog peripheral of AUX. In AUX this can also refer to the event coming from this comparator
AUX_SCE | Short | Auxiliary Sensor Domain Controller
BASEPRI | Short | Special register in CPU used to prevent activation of exceptions based on their priority level
BAW | Short | Bulk Acoustic Wave
BAW_CLKGOOD | Signal | Internal Signal
BCLK | Short | Bit clock for the WCLK and serial audio data signals. This signal is an input when using an external clock source and output when using the internal clock source.
BFSR | Short | Bus Fault Status Register
BGAP | Short | Bandgap
BKPT | Short | CPU instruction, BreaKPoinT
BUS | Short | Interconnect or power domain including interconnect
BW | Short | BandWidth
BX | Short | CPU instruction, Branch and eXchange instruction set
CCP | Short | Capture Compare PWL
CLKCTRL | Module | Power domain that contains clock management for MCU system
CLKOUT | Short | SSI Clock Out, primary Output from SSI to IOs
CLK_DCDC | Signal | Internal Signal
COMPA | Module | Comparator A.
COMPB | Module | Comparator B
COMP_IN | Signal | Internal Signal
CONTROL | Short | Special register in CPU used to control selector for main stack/process stack and selector for privileged/unpriviledged modes
CPI | Short | Cycles Per Instruction
CPU | Short | Central processing unit or power domain including system CPU
CRC | Short | Cyclical Redundancy Check algorithm
CRYPTO | Module | Encryption engine
CTS | Short | Clear To Send, primary input to UART module from Ios
DAC | Short | Digital to Analog Converter
DAC_REF | Signal | DAC Reference
DAP | Short | Debug Access Port
DCDC | Module | DCDC regulator for regulating VDDR
DDI | Module | Didital to Digital Interface
DEEPSLEEP | Short | DeepSleep Mode for CPU
DIO | Short | Digital IO
DMA | Short | Direct Memory Access
DOUBLER | Module | Frequency doubling sub-module
DOUBLER_EN | Signal | Internal Signal
DOUBLER_RST | Signal | Internal Signal
DOULBER_RESET | Signal | Internal Signal
DSP | Short | Single Phase Audio Interface Format
DWT | Short | Subblock in CPU. See CPU_DWT
EPSR | Short | Execution PSR
ETM | Short | Enhanced Trace Macrocell
EVENT | Module | Event Fabric
EXC_RETURN | Signal | A pre-defined value saved to LR on exception entry. This value indicates the required return stack and processor mode when returning from the exception
FAULTMASK | Short | Special register in CPU used to prevent activation of all exceptions except NMI
FF1 | Short | Feed-Forward cell 1 gain. This is one of the loop filter gm-cells which adjusts the noise shaping characteristics.
FF2 | Short | Feed-Forward cell 2 gain. This is one of the loop filter gm-cells which adjusts the noise shaping characteristics.
FF3 | Short | Feed-Forward cell 3 gain. This is one of the loop filter gm-cells which adjusts the noise shaping characteristics.
FIFO | Short | First In First Output
FILTER_OUT | Signal | Internal Signal
FLASH | Module | FLASH
FMC | Module | Flash Memory Controller
FPB | Short | Subblock in CPU. See CPU_FPB
FSM | Short | Finite State Machine
FSS | Short | Serial Frame signal for SSI interface
FW | Short | Firmware
GBIAS | Short | Global Bias
GLDO | Module | Global LDO for regulating VDDR
GPIO | Module | General Purpose Input/Output
GPRAM | Short | General Purpose RAM
GPT | Module | General Purpose Timer
GPT0 | Module | GPT module 0
GPT1 | Module | GPT module 1
GPT2 | Module | GPT module 2
GPT3 | Module | GPT module 3
HF | Short | High Frequency
HOLD | Signal | State
HP | Short | High Performance / High Power
HPM | Short | High Performance/Power Mode
HPM_RAMP1 | Signal | State
HPM_RAMP3 | Signal | State
HPM_UPDATE | Signal | State
HW | Short | Hardware
I2C | Module | Inter-Integrated Circuit, a multimaster serial single-ended computer bus
I2S | Module | Inter-IC Sound, our audio interface
IBIAS | Short | Bias Current
IBIAS_CAP_UPDATE | Signal | State
IBIAS_INCREMENT | Signal | State
ID | Short | IDentification number
IDAC | Short | ADC in OSC_DIG
IDAC_DECREMENT_WITH_MEASURE | Signal | State
IDLE | Signal | State
IFADC | Module | Intermediate Frequency Analog to Digital Converter
IFAMP | Module | Intermediate Frequency AMPlifier
IO | Short | Input/Output
IOC | Module | Input / Output Configurator
IPSR | Short | Interrupt PSR
IPTAT | Short | Current Proportional to Absolute Temperature
IREF | Short | Constant current REFerence (REF)
ISR | Short | Interrupt Service Routine
ISRC | Short | Current source
ISRC_RESET | Signal | This signal clamps the output of the current source. The signal can also be used as an event in AUX
IT | Short | CPU instruction, IF-THEN
ITM | Short | Instrumentation Trace Macrocell
JTAG | Short | Joint Test Action Group. The name of the organization that developed standard IEEE 1149.1. This standard defines a boundary-scan architecture used for in-circuit testing of integrated circuit devices. It is commonly known by the initials JTAG.
LDM | Short | CPU instruction, Load Multiple
LDO | Short | Low Drop-Out voltage regulator
LDR | Short | CPU instruction, Load Register
LDRD | Short | CPU instruction, Doubleword Load Register
LFSR | Short | Linear Feedback Shift Register
LJF | Short | Dual Phased Left Justified Audio Interface Format
LNA | Short | Low-Noise Amplifier
LP | Short | Low Power
LPBUFF | Short | Low Power Buffer
LPM | Short | Low Power Mode
LPM_IBIAS_WAIT_CNT | Signal | Internal Signal
LPM_UPDATE | Signal | State
LR | Short | Link Register 12 from Cortex M Processor
LSB | Short | Least Significant Bit
LSU | Short | Load Store Unit
MCLK | Short | High-speed master clock used for sample conversion in the external audio device. This signal is not unused when using an external clock source.
MCU | Short | Microcontroller Unit
MCUCLK | Short | Undivided MCU system clock
MCU_AON | Short | Power doamin that is always powered when MCU voltage domain is powered
MCU_AONIF | Module | Always on interface module
MCU_EV | Short | Event from MCU domain to AUX. Source is configurable in event fabric
MMFSR | Short | Memory Manage Fault Status Register
MPU | Short | Memory Protection Unit
MRS | Short | CPU instruction, Move the contents of a special register to a general-purpose register
MSB | Short | Most Significant Bit
MSP | Short | Main Stack Pointer
NANOAMP_BIAS | Module | Submodule generating nA bias currents
NMI | Short | Non-Maskable Interrupt
NMOS | Short | N-channel MOS transistor
NOM | Short | Nominal value
NRTZ | Short | Non-Return-to-Zero
NRZ | Short | Non Return-to-Zero
NVIC | Short | Nested Vectored Interrupt Controller
OBSMUX0 | Short | In AUX this refers to bit 0 of the signals that can be routed from the observability mux to AUX
OBSMUX1 | Short | In AUX this refers to bit 1 of the signals that can be routed from the observability mux to AUX
OBSMUX2 | Short | In AUX this refers to bit 2 of the signals that can be routed from the observability mux to AUX
OBSMUX3 | Short | In AUX this refers to bit 3 of the signals that can be routed from the observability mux to AUX
OSC | Short | Oscillator (see also ANAOSC)
OSCHFANA | Signal | Internal Signal
OSCHFCLK | Signal | Internal Signal
OSCLF | Signal | Internal Signal
OSCLFANA | Signal | Internal Signal
OSCLFCLK | Signal | Internal Signal
OSC_DIG | Module | Oscillators Digital control
OSC_TOP | Module | Oscillator System Top level. One of the main blocks in top level analog.
PA | Module | Power Amplifier
PC | Short | Program Counter
PERIPH | Short | Power domain including peripheral modules
PLL | Short | Phase Locked Loop
PMOS | Short | P-channel MOS transistor
POP | Short | CPU instruction, Pop register(s) off the stack
PRBS2 | Short | Psueudo Random Bit Sequence number 2, delayed
PRBS2d | Short | Psuedo Random Bit Sequence 2, delayed. Can be used for generation of dither noise to remove tones, or it can be output on the IFADC data outputs to check the integrity of the digital output path from the ADC.
PRCM | Module | Power Reset Clock Manager
PRIMASK | Short | Special register in CPU used to prevent activation of all exceptions with configurable priority
PSP | Short | Process Stack Pointer
PSR | Short | Program Status Register
PWM | Short | Pulse Width Modulation
Q1 | Short | XTAL oscillator input node
Q2 | Short | XTAL oscillator output node
R0 | Short | General-purpose Register 0 from Cortex M Processor
R1 | Short | General-purpose Register 1 from Cortex M Processor
R10 | Short | General-purpose Register 10 from Cortex M Processor
R11 | Short | General-purpose Register 11 from Cortex M Processor
R12 | Short | General-purpose Register 12 from Cortex M Processor
R2 | Short | General-purpose Register 2 from Cortex M Processor
R3 | Short | General-purpose Register 3 from Cortex M Processor
R4 | Short | General-purpose Register 4 from Cortex M Processor
R5 | Short | General-purpose Register 5 from Cortex M Processor
R6 | Short | General-purpose Register 6 from Cortex M Processor
R7 | Short | General-purpose Register 7 from Cortex M Processor
R8 | Short | General-purpose Register 8 from Cortex M Processor
R9 | Short | General-purpose Register 9 from Cortex M Processor
RADC | Short | ADC in OSC_DIG
RADC_DIG | Short | Digital Control for RADC
RC | Short | Resistor Capacitor
RCOSC | Short | RC Oscillator
RCOSCHF | Short | See rcosc_hf
RCOSC_HF | Short | High Frequency RC Oscillator
RCOSC_HF_CLK | Signal | Internal Signal
RCOSC_LF | Short | Low Frequency RC Oscillator
RCOSC_LF_CLK | Signal | Internal Signal
REFSYS | Short | Reference System. Module generating refernce voltages and reference currents for use in analog blocks.
RF | Module | Radio Frequency
RFC | Module | RF Core
RFLDO | Module | LDO for RF modules
RFN | Signal | RF Negative net
RFP | Signal | RF Positive net
RF_TOP | Module | Radio Frequency Top level block (LNA, PA, Mixers)
RJF | Short | Dual Phased Right Justified Audio Interface Format
ROM | Short | Read Only Memory
RTC | Short | Real Time Clock
RTC_4KHZ | Short | 4 kHz signal coming from the RTC counter. Can be used by timers in AUX
RTC_CH2_EV | Short | Event that goes high every time the RTC channel 2 generates an event
RTC_UPD | Signal | 16 KHz signal used to synchronize the radio timer to RTC
RTOS | Short | Real-Time Operating System
RTS | Short | Request To Send, primary output from UART module to Ios
RTZ | Short | Return-to-Zero
RX | Short | Receive
RXD | Short | SSI Receive Input, primary input to SSI from IOs
RXTX | Short | RX / TX. Pin on device
SAR | Short | Successive Approximation Register (used for Binary Search)
SCK | Short | Serial Clock for AON SPI-S interface. (IOC Contex)
SCL | short | Serial CLock, I2C clock line
SCLK_HF | Short | System Clock High Frequency
SCLK_LF | Short | System Clock Low Frequency
SCLK_MF | Short | System Clock Medium Frequency
SCS | Signal | Serial Chip Select for AON SPI-S Interface. (IOC Context)
SDI | Signal | Serial Data In for AON SPI-S Interface. (IOC Contex)
SDIV | Short | CPU instruction, Signed Divide
SDO | Signal | Serial Data Out for AON SPI-S Interface. (IOC Contex)
SERIAL | Short | Power domain including serial modules
SEV | Short | CPU instruction, Send Event
SHUTDOWN | Short | Lowest possible powermode, where all but the VDDS domain is powered off
SLDO | Module | Synth LDO
SMI | Short | Serial Modem Interface
SMPH_AUTOTAKE_DONE | Short | A semaphore has been released to c3po using the AUTOTAKE feature in AUX_SMPH module
SOCAUX | Short | Not a good term...
SOC_AUX | Short | Not a good term...
SP | Short | Stack Pointer
SPI | Short | Serial Peripheral Interface
SPI-S | Module | Serial Peripheral Interface Slave
SRAM | Short | Static Random Access Memory
SSI | Short | Synchronous Serial Interface
SSI0 | Module | Instance 0 of SSI Module
SSI1 | Module | Instance 1 of SSI Module
STM | Short | CPU instruction, Store Multiple
STRD | Short | CPU instruction, Doubleword Store Register
SVC | Short | CPU instruction, Supervisor Call
SW | Short | Software
SWEV0 | Short | SW triggered event 0 from AUX to AON. Triggered by writes to AUX_EVCTL:SWEVSET
SWEV1 | Short | SW triggered event 1 from AUX to AON. Triggered by writes to AUX_EVCTL:SWEVSET
SWEV2 | Short | SW triggered event 2 from AUX to AON. Triggered by writes to AUX_EVCTL:SWEVSET
SWO | Short | Serial Wire Output
SWV | Signal | Serial Wire Viewer Debug Signal from CPU Module
SYSBUS | Short | CPU system bus
TAP | Short | Test Access Port
TCK | Signal | JTAG compliant pin (test clock)
TDC | Short | Time to Digital Converter
TDC_DONE | Short | Time to Digital Conversion done. Event available in AUX
TDC_PRE | Signal | Time to digital prescaler output. Can be used as an event in the TDC
TDI | Short | Test Data In for JTAG interface
TDO | Short | Test Data Out for JTAG interface
TI | Short | Texas Instruments
TIMER0_EV | Short | Event from timer0 in AUX. Event triggered when timer count >= target value
TIMER1_EV | Short | Event from timer1 in AUX. Event triggered when timer count >= target value
TPA | Short | Trace Port Analyzer
TPIU | Short | Subblock in CPU. See CPU_TPIU
TRACECLK | Signal | Trace Clock Signal From CPU Module
TRACEDATA | Signal | Trace Data Bus signal From CPU Module
TRNG | Module | True Random Number Generator
TX | Short | Transmit
TXD | Short | SSI Transmit Output, primary output from SSI to IOs
TXO | Short | Temperature Compensated Crysal Oscillator, alternalive to simple XTAL
UART | Short | Universal Asynchronous Receiver/Transmitter
UART0 | Module | Instance 0 of UART Module
UARTRXD | Short | Receive input, Primary input to UART module from Ios
UARTTXD | Short | Transmit output, Primary output from UART module to Ios
UDIV | Short | CPU instruction, Unsigned Divide
UDMA | Module | Micro DMA
UFSR | Short | Usage Fault Status Register
V2I | Short | Voltage to Current
VBN | Signal | Internal Signal
VBP | Signal | Internal Signal
VCO | Short | Votage Controlled Oscillator
VCOLDO | Module | LDO for VCO
VCTRL | Signal | Internal Signal
VDD | Signal | Regulated supply voltage for digital domain.
VDDA | Signal | Positive supply voltage
VDDR | Signal | Regulated (1.7V?) supply voltage.
VDDR_OK | Signal | Signal indicating that VDDR Supply voltage is good
VDDS | Signal | Main supply voltage (battery).
VDDS2 | Signal | Supply pin for IO cells on segment 2
VDDS3 | Signal | Supply pin for IO cells on segment 3
VDDS_BOD_OK | Signal | Signal indicating that VDDS Supply voltage is good
VDD_BOD_OK | Signal | Signal indicating that VDD Supply voltage is good
VDD_LOCAL | Signal | Internal Signal
VIMS | Short | Power domain including Flash memory
VMAX | Short | Voltage Max
VMIN | Short | Voltage Min
VREF | Signal | Voltage Reference
WASP | Short | Wireless Audio Streaming Protocol
WCLK | Short | Sample framing signal/clock that defines the sample frequency and the word boundaries in the serial data stream. The WCLK frequency is identical to the sample frequency. This signal is an input when using an external clock source and output when using the internal clock source.
WDT | Module | Watch Dog Timer
WFE | Short | CPU instruction, Wait For Event
WFI | Short | CPU instruction, Wait For Interrupt
WIC | Module | Wakeup Interrupt Controller
WUC | Module | Wake Up Controller
WUC_TAP | Short | Wake Up Controller Test Access Port
X48P | Short | Pin on device dedicated to 48MHz xtal/oscillator
XN | Short | eXecute Never
XOSC | Short | Xrystal Oscillator
XOSCHF | Short | See xosc_hf
XOSC_HF | Short | High Frequency Xrystal Oscillator
XOSC_LF | Short | Low Frequency Xrystal Oscillator
XPSR | Short | Program Status Register
XTAL | Short | Crystall
aclk_ref | Signal | Same as ACLK_REF
adc_data | Signal | Internal Signal
ampcomp_req | Signal | Internal Signal
cap_init_column | Signal | Internal Signal
cap_init_row | Signal | Internal Signal
dtst_osc_clkin | Signal | Internal Signal
ibias_cap_updated | Signal | Internal Signal
ibias_dec_with_measure | Signal | Internal Signal
ibias_inc | Signal | Internal Signal
ibias_wait_cntr | Signal | Internal Signal
idac_dec_with_measure | Signal | Internal Signal
idac_increment | Signal | Internal Signal
oscdig_clk | Signal | Internal Signal
ppm | Short | Parts Per Million
rcosc_hf | Signal | RC-oscillator High Frequency module or the clock signal outputted by this module
rcosc_hf_clk | Signal | Internal Signal
rcosc_hf_d24m_clk | Signal | Internal Signal
rcosc_hf_dlf | Signal | Internal Signal
rcosc_hf_dlf_clk | Signal | Internal Signal
rcosc_hf_dmf_clk | Signal | Internal Signal
rcosc_lf | Signal | RC-oscillator Low Frequency module or the clock signal outputted by this module
rcosc_lf_clk | Signal | Internal Signal
sclk_hf | Signal | System Clock High Frequency
sclk_lf | Signal | System Clock, Low Frequency
sclk_mf | Signal | Internal Signal
uDIGLDO | Short | See uDIG
uDMA | Short | Micro DMA, anARM IP
uLDO | Module | Micropower Low Drop-out Voltage Regulator
xosc_hf | Signal | XOSC High frequency module or the clock signal outputted by this module
xosc_hf_d24m_clk | Signal | Internal Signal
xosc_hf_dlf | Signal | Internal Signal
xosc_hf_dlf_clk | Signal | Internal Signal
xosc_hf_dmf_clk | Signal | Internal Signal
xosc_hf_idac | Signal | Internal Signal
xosc_lf | Signal | XOSC Low frequency module or the clock signal outputted by this module
xosc_lf_clk | Signal | Internal Signal
xosc_lf_q1 | Signal | Internal Signal
xosclf | Signal | See xosc_lf