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
WO[1:0] Waveform Outputs Output  
Timer Counter - TCCx
WO[1:0] Waveform Outputs Output  
Peripheral Touch Controller - PTC
X[15:0] PTC Input Analog  
Y[15:0] PTC Input Analog  
General Purpose I/O - PORT
PA25 - PA00 Parallel I/O Controller I/O Port A I/O  
PA28 - PA27 Parallel I/O Controller I/O Port A I/O  
PA31 - PA30 Parallel I/O Controller I/O Port A I/O  
PB17 - PB00 Parallel I/O Controller I/O Port B I/O  
PB23 - PB22 Parallel I/O Controller I/O Port B I/O  
PB31 - PB30 Parallel I/O Controller I/O Port B I/O  
Universal Serial Bus - USB
DP DP for USB I/O  
DM DM for USB I/O  
SOF 1kHz USB Start of Frame I/O