Datasheet

56
XMEGA A1U [DATASHEET]
Atmel-8385H-AVR-ATxmega64A1U-128A1U-Datasheet–AVR–04/2014
33. 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.
33.1 Alternate Pin Function Description
The tables below show the notation for all pin functions available and describe its function.
33.1.1 Operation/ Power Supply
33.1.2 Port Interrupt functions
33.1.3 Analog functions
33.1.4 External Bus Interface functions
V
CC
Digital supply voltage
AV
CC
Analog supply voltage
GND Ground
SYNC Port pin with full synchronous and limited asynchronous interrupt function
ASYNC Port pin with full synchronous and full asynchronous interrupt function
ACn Analog Comparator input pin n
ACnOUT Analog Comparator n Output
ADCn Analog to Digital Converter input pin n
DACn Digital to Analog Converter output pin n
A
REF
Analog Reference input pin
An Address line n
Dn Data line n
CSn Chip Select n
ALEn Address Latch Enable pin n (SRAM)
RE Read Enable (SRAM)
WE External Data Memory Write (SRAM /SDRAM)
BAn Bank Address (SDRAM)
CAS Column Access Strobe (SDRAM)
CKE SDRAM Clock Enable (SDRAM)
CLK SDRAM Clock (SDRAM)
DQM Data Mask Signal/Output Enable (SDRAM)
RAS Row Access Strobe (SDRAM)