46 Appendix B: Acronyms and Abbreviations

Table 46-1. Acronyms and Abbreviations
Acronyms	Abbreviations
AC	Analog Comparator
ADC	Analog-to-Digital Converter
AES	Advanced Encryption Standard
AGC	Automatic Gain Control
AHB	Advanced High-Speed Bus
Apple® NCS	Apple Notification Center Service
AON	Always ON
APB	Advanced Peripheral Bus
API	Application Programming Interface
Arb	Arbiter
BFM	Boot Flash Memory
BG	Bandgap
Bluetooth® LE	Bluetooth Low Energy
BOD	Brown-out Detect
BOM	Bill of Material
BOR	Brown-out Reset
Bluetooth QTF	Bluetooth Qualification Test Facility
CCL	Configurable Custom Logic
CDM	Charged Device Model
CFG	System Configuration and Register Locking
CFGCON	Configuration Control
CLDO	Core Low Dropout Regulator
CLK	Clock
CM	Configuration Mismatch Reset
CM4CPU	Cortex M4F Processor
CMCC	Cortex M Cache Controller
CMR	Configuration Mismatch Reset
CN	Change Notification
CNCON	Change Notice Control
CNEN	Change Notice Enable
CNF	Change Notice Flag
CNPDE	Change Notice Pull-down Enable
CNPUE	Change Notice Pull-up Enable
CNSTAT	Change Notice Status
CP	Charge Pump
CPU	Central Processing Unit
CRC	Cyclic Redundancy Check
CRM	Continuous Read Mode
CoreSight™ ROM	CoreSight ROM
CRU	Clock and Reset Unit
CS	Chip Select
CSD	Controlled Switching Device
CVD	Capacitive Voltage Divider
DAC	Digital-to-Analog Converter
DAP	Debug Access Port
DCC	Debug Communication Channel
DDR	Double Data Rate
DED	Double-bit Error Detected
DFE	Digital Front-End
DMAC	Direct Memory Access Controller
DMA RD	DMA-Read
DMA WR	DMA-Read
DMT	Deadman Timer
DMTCON	Deadman Timer Control
DMTEN	Deadman Timer Enable
DMTR	Deadman Timer Reset
DSCTRL	Deep Sleep System Controller
DSP	Digital Signal Processor
DSU	Device Service Unit
DSWDT	Deep Sleep WDT
DTI	Dead-Time Insertion
ECC	Error Correction Code
ECDH	Elliptic-Curve Diffie-Hellman encryption
EIC	External Interrupt Controller
EOC	End-Of-Convert
EOS	Electrical Overstress
ERR	Error
ESD	Electrostatic Discharge
ETB	Embedded Trace Buffer
ETM	Embedded Trace Module
EVSYS	Event System Interface
FC	Flash Controller
FCS	Frame Check Sequence
FEM	Front-End Module
FPB	Flash Patch and Breakpoint Unit
FPU	Floating Point Unit
FRC	Fast RC Oscillator
FRCDIV	FRC Divider
FREQM	Frequency Meter
FSCM	Fail-Safe Clock Monitor
FSM	Finite State Machine
GATT	Generic Attribute Profile (Bluetooth)
GCLK	Generic Clock Controller
GCM	Galois Counter Mode
GND	Ground
GPIO	General Purpose I/O
HBM	Human Body Model
HCI	Host Controller Interface
I2C	Inter-Integrated Circuit
ICM	Integrity Check Module
IoT	Internet of Things
IRQ	Interrupt Request
ITM	Instrumentation Trace Macrocell
LDO	Low Dropout Regulator
LE	Low-Energy
LIN	Local Interconnect Network
LNA	Low-Noise Amplifier
LO	Local Oscillator
LPCLK	Low Power Clock Generation
LPRC	Low Power RC Oscillator
LUT	Each Look-Up Table
LVD	Low-Voltage Detect
MCLRF	Master Clear Filter
MCS	Master Clock Switch
MCU	Microcontroller Unit
MFRQ	Match Frequency
MLDO	Main LDO
MPU	Memory Protection Unit
NDA	Non-Disclosure Agreement
NFRQ	Normal Frequency
NMCLR	External Reset
NMI	Non-Maskable Interrupt
NMITR	NMI Time-out Reset
NPWM	Normal Pulse-Width Modulation
NVIC	Nested Vector Interrupt Controller
NVM	Non-Volatile Memory
NVMOP	Non-Volatile Memory Operation
OCD	On-Chip Debug
OTA	Over-The-Air
OTF	On-The-Fly
OTMX	Output Matrix
OTP	One Time Programmable
PA	Power Amplifier
PAC	Peripheral Access Controller
PCHE	Prefetch Cache
PFM	Program Flash Memory
PHY	Physical Layer
PLL	Phase-Locked Loop
PMD	Peripheral Module Disable
PMU	Power Management Unit
POR	Power-on Reset
POSC	Primary Crystal Oscillator
PPS	Peripheral Pin Select
PPW	Period and Pulse-Width
PSDU	PLCP Service Data Unit
PSM	Pulse Skipping Mode
PUKCC	Public Key Cryptography Controller
PUKCL	Public Key Cryptography Library
PWM	Pulse Width Modulation
QoS	Quality of Service
QSPI	Quad I/O Serial Peripheral Interface
QSPI	Quad SPI interface
RAMECC	RAM Error Correction Code
RCON	Reset Control
REG	Register
RF	Radio Frequency
RFFE	RF Front-End
RoT	Root of Trust
RPC	Remote Procedure Call
RSSI	Receive Signal Strength Indication
RTC	Real-Time Counter
RTCC	Real-Time Clock Calender
RTOS	Real-Time Operating System
RTSP	Run-Time Self Programming
RX	Receive
RXC	Receive Complete
SEC	Single-bit Error Corrected
SERCOM	Serial Communication Interface
SERCOM I²C	SERCOM Inter-Integrated Circuit
SFD	Start Frame Delimiter (Zigbee®)
SFR	Special Function Register
SHA	Secure Hash Algorithm
SMBus™	System Management Bus
SoC	System-on-Chip
SOSC	Secondary Crystal Oscillator
SPI	Serial Peripheral Interface
SRCON	Slew Rate Control
SSL	SPI Select Low
SWD	Serial Wire Debug
SWR	Software Reset
SWV	Serial Wire Viewer
Synth	Synthesizer
SYSRST	System Reset
TC	Timer Counter
TCC	Timer Counter Control
TCM	Tightly Coupled Memory
TPIU	Trace Port Interface Unit
TRNG	True Random Number Generator
TRX	Transmit/Receive
TX	Transmit
TXC	Transmit Complete
UART	Universal Asynchronous Receiver/Transmitter
USART	Universal Synchronous/Asynchronous Receiver/Transmitter
VGA	Variable Gain Amplifier
WDT	Watchdog Timer
WDTO	Watchdog Time-Out Reset
WDTR	Watchdog Timer Reset
XDS	Extreme Deep Sleep
xIP	Execute-In-Place
XTAL	Crystal Oscillator
ZPBOR	Zero-Power BOR