ATMEGA640 datasheet(97/449 Pages) ATMEL

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ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 48.

The alternate pin configuration is as follows:

• T0 – Port D, Bit 7

T0, Timer/Counter0 counter source.

• T1 – Port D, Bit 6

T1, Timer/Counter1 counter source.

• XCK1 – Port D, Bit 5

XCK1, USART1 External clock. The Data Direction Register (DDD5) controls whether

the clock is output (DDD5 set) or input (DDD5 cleared). The XCK1 pin is active only

when the USART1 operates in Synchronous mode.

• ICP1 – Port D, Bit 4

ICP1 – Input Capture Pin 1: The PD4 pin can act as an input capture pin for

Timer/Counter1.

• INT3/TXD1 – Port D, Bit 3

INT3, External Interrupt source 3: The PD3 pin can serve as an external interrupt source

to the MCU.

TXD1, Transmit Data (Data output pin for the USART1). When the USART1 Transmitter

is enabled, this pin is configured as an output regardless of the value of DDD3.

• INT2/RXD1 – Port D, Bit 2

INT2, External Interrupt source 2. The PD2 pin can serve as an External Interrupt

source to the MCU.

RXD1, Receive Data (Data input pin for the USART1). When the USART1 receiver is

enabled this pin is configured as an input regardless of the value of DDD2. When the

USART forces this pin to be an input, the pull-up can still be controlled by the PORTD2

bit.

Table 48. Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

T0 (Timer/Counter0 Clock Input)

PD6

T1 (Timer/Counter1 Clock Input)

PD5

XCK1 (USART1 External Clock Input/Output)

PD4

ICP1 (Timer/Counter1 Input Capture Trigger)

PD3

INT3/TXD1 (External Interrupt3 Input or USART1 Transmit Pin)

PD2

INT2/RXD1 (External Interrupt2 Input or USART1 Receive Pin)

PD1

INT1/SDA (External Interrupt1 Input or TWI Serial DAta)

PD0

INT0/SCL (External Interrupt0 Input or TWI Serial CLock)

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