ATXMEGA128B1 Datasheet, PDF (52/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller

32. Pinout and Pin Functions
The device pinout is shown in “Pinout/Block Diagram” on page 3. In addition to general purpose I/O functionality, each
pin can have several alternate functions. This will depend on which peripheral is enabled and connected to the actual pin.
Only one of the pin functions can be used at time.
32.1 Alternate Pin Function Description
The tables below show the notation for all pin functions available and describe its function.
32.1.1 Operation/Power Supply
VCC
AVCC
GND
AGND
Digital supply voltage
Analog supply voltage
Ground
Analog Ground
32.1.2 Port Interrupt functions
SYNC
ASYNC
Port pin with full synchronous and limited asynchronous interrupt function
Port pin with full synchronous and full asynchronous interrupt function
32.1.3 Analog functions
ACn
ACnOUT
ADCn
AREF
Analog Comparator input pin n
Analog Comparator n Output
Analog to Digital Converter input pin n
Analog Reference input pin
32.1.4 LCD functions
SEGn
COMn
VLCD
BIAS2
BIAS1
CAPH
CAPL
LCD Segment Drive Output n
LCD Common Drive Output n
LCD Voltage Multiplier Output
LCD Intermediate Voltage 2 Output (VLCD * 2/3)
LCD Intermediate Voltage 1 Output (VLCD * 1/3)
LCD High End Of Flying Capacitor
LCD Low End Of Flying Capacitor
XMEGA B1 [DATASHEET] 52
8330C–AVR–07/2012