5 Signal Descriptions List

The following table provides details on signal names classified by peripherals.

Table 5-1. Signal Descriptions List
Signal NameFunctionType
Generic Clock Generator - GCLK
GCLK_IO[4:0]Generators Clock Source (Input) or Generic Clock Signal (Output)Digital I/O
Oscillators Control - OSCCTRL
XINCrystal Oscillator or External Clock InputAnalog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUTCrystal Oscillator OutputAnalog Output
32 kHz Oscillators Control - OSC32KCTRL
XIN3232.768 kHz Crystal Oscillator or External Clock InputAnalog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUT3232.768 kHz Crystal Oscillator OutputAnalog Output
Serial Communication Interface - SERCOMx
PAD[3:0]General SERCOM PinsDigital I/O
Timer Counter - TCx
WO[1:0]Capture Inputs or Waveform OutputsDigital I/O
Real Timer Clock - RTC
IN[3:0]Tamper Detection InputsDigital Input
OUT[3:0]Tamper Detection OutputsDigital Output
Analog Comparators - AC
AIN[3:0]AC Comparator InputsAnalog Input
CMP[1:0]AC Comparator OutputsDigital Output
Analog Digital Converter - ADC
AIN[9:0]ADC Input ChannelsAnalog Input
VREFA(1)ADC External Reference Voltage AAnalog Input
VREFBADC External Reference Voltage BAnalog Input
Digital Analog Converter - DAC
VOUTDAC Voltage OutputAnalog Output
VREFA(1)DAC External Reference Voltage AAnalog Input
Operational Amplifier - OPAMP
OA[2:0]NEGOPAMP Negative InputsAnalog Input
OA[2:0]POSOPAMP Positive InputsAnalog Input
OA0OUT / OA2OUTOPAMP OutputsAnalog Output
Peripheral Touch Controller - PTC
XY[19:0]X-lines and Y-linesDigital Output (X-line) /Analog I/O (Y-line)
Custom Control Logic - CCL
IN[5:0]Inputs to lookup tableDigital Input
OUT[1:0]Outputs from lookup tableDigital Output
External Interrupt Controller - EIC
EXTINT[7:0]External Interrupts PinsDigital Input
NMINon-Maskable Interrupt PinDigital Input
General Purpose I/O - PORT
PA11-PA00 / PA19-PA14 / PA25-PA22 / PA27 / PA31-PA30General Purpose I/O Pin in Port ADigital I/O
Reset Controller - RSTC
RESETExternal Reset Pin (Active Level: LOW)Digital Input
Debug Service Unit - DSU
SWCLKSerial Wire ClockDigital Input
SWDIOSerial Wire Bidirectional Data PinDigital I/O
  1. VREFA is shared between the ADC and DAC peripherals.