ATMEGA640 datasheet(80/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

13.3.4

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 13-12.

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.

Table 13-11. Overriding Signals for Alternate Functions in PC3:PC0

Signal

Name

PC3/A11

PC2/A10

PC1/A9

PC0/A8

PUOE

SRE • (XMM<5)

SRE • (XMM<6)

SRE • (XMM<7)

PUOV

DDOE

SRE • (XMM<5)

SRE • (XMM<6)

SRE • (XMM<7)

DDOV

PVOE

SRE • (XMM<5)

SRE • (XMM<6)

SRE • (XMM<7)

PVOV

A11

A10

DIEOE

DIEOV

––

AIO

–

Table 13-12. 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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