5 Signal Descriptions List

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

Table 5-1. Signal Descriptions List ⁽¹⁾
Signal Name	Function	Type
Generic Clock Generator (GCLK)
GCLK_IO[7:0]	Generators Clock Source (Input) or Generic Clock Signal (Output)	Digital I/O
Oscillators Control (OSCCTRL)
XIN	Crystal Oscillator or External Clock Input	Analog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUT	Crystal Oscillator Output	Analog Output
32 kHz Oscillators Control (OSC32KCTRL)
XIN32	32.768 kHz Crystal Oscillator or External Clock Input	Analog Input (Crystal Oscillator)/Digital Input (External Clock)
XOUT32	32.768 kHz Crystal Oscillator Output	Analog Output
Universal Serial Bus (USB)
DP	Differential Data Line + Port	Digital I/O
DM	Differential Data Line - Port	Digital I/O
SOF 1kHz	USB Start of Frame Output	Digital Output
Serial Communication Interface (SERCOMx)
PAD[3:0]	General SERCOM Pins	Digital I/O
Inter-IC Sound Controller (I²S)⁽³⁾
MCK[1:0]	Host Clock Pins	Digital I/O
SCK[1:0]	Serial Clock Pins	Digital I/O
FS[1:0]	I²S Word Select / TDM Frame Sync Pins	Digital I/O
SDO	Serial Data Output for Transmit Serializer	Digital Output
SDI	Serial Data Input for Receive Serializer	Digital Input
Timer Counter (TCx)
WO[1:0]	Capture Inputs or Waveform Outputs	Digital I/O
Timer Counter for Control (TCCx)⁽³⁾
WO[7:0]	Capture Inputs or Waveform Outputs	Digital I/O
Real Timer Clock (RTC)
IN[7:0]	Tamper Detection Inputs	Digital Input
OUT[7:0]	Tamper Detection Outputs	Digital Output
Analog Comparators (AC)
AIN[7:0]	AC Comparator Inputs	Analog Input
CMP[3:0]	AC Comparator Outputs	Digital Output
Analog Digital Converter (ADC)
AIN[23:0]	ADC Input Channels	Analog Input
VREFA⁽²⁾	ADC External Reference Voltage A	Analog Input
VREFB	ADC External Reference Voltage B	Analog Input
Digital Analog Converter (DAC)
VOUT0	DAC Voltage Output 0	Analog Output
VOUT1	DAC Voltage Output 1	Analog Output
VREFA⁽²⁾	DAC External Reference Voltage A	Analog Input
Operational Amplifier (OPAMP)
OA[2:0]NEG	OPAMP Negative Inputs	Analog Input
OA[2:0]POS	OPAMP Positive Inputs	Analog Input
OA[2:0]OUT	OPAMP Outputs	Analog Output
Peripheral Touch Controller (PTC)
XY[31:0]	X-lines and Y-lines	Digital Output (X-line) /Analog I/O (Y-line)
Custom Control Logic (CCL)
IN[11:0]	Inputs to lookup table	Digital Input
OUT[3:0]	Outputs from lookup table	Digital Output
External Interrupt Controller (EIC)
EXTINT[15:0]	External Interrupts Pins	Digital Input
NMI	Non-Maskable Interrupt Pin	Digital Input
General Purpose I/O (PORT)
PA25-PA00 / PA31-PA30	General Purpose I/O Pin in Port A	Digital I/O
PB09-PB00 / PB25-PB12 / PB31-PB30	General Purpose I/O Pin in Port B	Digital I/O
PC03-PC00 / PC21-PC05 / PC28-PC24	General Purpose I/O Pin in Port C	Digital I/O
Reset Controller (RSTC)
RESET	External Reset Pin (Active Level: LOW)	Digital Input
Debug Service Unit (DSU)
SWCLK	Serial Wire Clock	Digital Input
SWDIO	Serial Wire Bidirectional Data Pin	Digital I/O

Note:

Refer to the Configuration Summary and Pinout and Packaging chapters for the list of peripherals, peripheral instances, channels, and input/output pins present in each variant.
The VREFA signal is shared between the ADC and DAC peripherals.
The TCC and I²S peripherals are not present on the PIC32CM1216 (128 KB Flash) devices.