ATXMEGA64A1 datasheet(49/99 Pages) ATMEL

49 / 99 page

8067I–AVR–04/09

XMEGA A1

29. Pinout and Pin Functions

The pinout of XMEGA A1 is shown in “Pinout/Block Diagram” on page 3. In addition to general

I/O functionality, each pin may have several functions. This will depend on which peripheral is

enabled and connected to the actual pin. Only one of the alternate pin functions can be used at

time.

29.1

Alternate Pin Function Description

The tables below shows the notation for all pin functions available and describes its function.

29.1.1

Operation/Power Supply

29.1.2

Port Interrupt functions

29.1.3

Analog functions

29.1.4

EBI functions

VCC

Digital supply voltage

AVCC

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

AC0OUT

Analog Comparator 0 Output

ADCn

Analog to Digital Converter input pin n

DACn

Digital to Analog Converter output pin n

AREF

Analog Reference input pin

Address line n

Data line n

CSn

Chip Select n

ALEn

Address Latch Enable pin n

(SRAM)

Read Enable

(SRAM)

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)

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