ATMEGA640 datasheet(88/436 Pages) MICROCHIP

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

DS40002211A

13.3.8

Alternate Functions of Port H

The Port H alternate pin configuration is as follows:

• T4 – Port H, Bit 7

T4, Timer/Counter4 counter source.

• OC2B – Port H, Bit 6

OC2B, Output Compare Match B output: The PH6 pin can serve as an external output for the Timer/Counter2 Out-

put Compare B. The pin has to be configured as an output (DDH6 set) to serve this function. The OC2B pin is also

the output pin for the PWM mode timer function.

• OC4C – Port H, Bit 5

OC4C, Output Compare Match C output: The PH5 pin can serve as an external output for the Timer/Counter4 Out-

put Compare C. The pin has to be configured as an output (DDH5 set) to serve this function. The OC4C pin is also

the output pin for the PWM mode timer function.

Table 13-23. Overriding Signals for Alternate Functions in PG3:PG0

Signal Name

PG3/TOSC2

PG2/ALE/A7

PG1/RD

PG0/WR

PUOE

AS2 • EXCLK

SRE

PUOV

000

DDOE

AS2 • EXCLK

SRE

DDOV

PVOE

SRE

PVOV

ALE

PTOE

–––

–

DIEOE

AS2 • EXCLK

DIEOV

000

–––

–

AIO

T/C2 OSC OUTPUT

–

Table 13-24. Port H Pins Alternate Functions

Port Pin

Alternate Function

PH7

T4 (Timer/Counter4 Clock Input)

PH6

OC2B (Output Compare and PWM Output B for Timer/Counter2)

PH5

OC4C (Output Compare and PWM Output C for Timer/Counter4)

PH4

OC4B (Output Compare and PWM Output B for Timer/Counter4)

PH3

OC4A (Output Compare and PWM Output A for Timer/Counter4)

PH2

XCK2 (USART2 External Clock)

PH1

TXD2 (USART2 Transmit Pin)

PH0

RXD2 (USART2 Receive Pin)

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