Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
12
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
5.
Signal Descriptions List
The following table gives details on signal names classified by peripheral.
Signal Name
Function
Type
Active Level
Analog Comparators - AC
AIN[3:0]
AC Analog Inputs
Analog
CMP[:0]
AC Comparator Outputs
Digital
Analog Digital Converter - ADC
AIN[19:0]
ADC Analog Inputs
Analog
VREFA
ADC Voltage External Reference A
Analog
VREFB
ADC Voltage External Reference B
Analog
Digital Analog Converter - DAC
VOUT
DAC Voltage output
Analog
VREFA
DAC Voltage External Reference
Analog
External Interrupt Controller
EXTINT[15:0]
External Interrupts
Input
NMI
External Non-Maskable Interrupt
Input
Generic Clock Generator - GCLK
GCLK_IO[7:0]
Generic Clock (source clock or generic clock generator output)
I/O
Inter-IC Sound Controller - I2S
MCK[1..0]
Master Clock
I/O
SCK[1..0]
Serial Clock
I/O
FS[1..0]
I2S Word Select or TDM Frame Sync
I/O
SD[1..0]
Serial Data Input or Output
I/O
Power Manager - PM
RESETN
Reset
Input
Low
Serial Communication Interface - SERCOMx
PAD[3:0]
SERCOM I/O Pads
I/O
System Control - SYSCTRL
XIN
Crystal Input
Analog/ Digital
XIN32
32kHz Crystal Input
Analog/ Digital
XOUT
Crystal Output
Analog
XOUT32
32kHz Crystal Output
Analog
Timer Counter - TCx