ATMEGA640 datasheet(107/449 Pages) ATMEL

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ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

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 Output 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 Output 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.

• OC4B – Port H, Bit 4

OC4B, Output Compare Match B output: The PH4 pin can serve as an external output for the

Timer/Counter2 Output Compare B. The pin has to be configured as an output (DDH4 set) to

serve this function. The OC4B pin is also the output pin for the PWM mode timer function.

• OC4A – Port H, Bit 3

OC4C, Output Compare Match A output: The PH3 pin can serve as an external output

for the Timer/Counter4 Output Compare A. The pin has to be configured as an output

(DDH3 set) to serve this function. The OC4A pin is also the output pin for the PWM

mode timer function.

• XCK2 – Port H, Bit 2

XCK2, USART2 External Clock: The Data Direction Register (DDH2) controls whether the clock is

output (DDH2 set) or input (DDH2 cleared). The XC2K pin is active only when the USART2 oper-

ates in synchronous mode.

• TXD2 – Port H, Bit 1

TXD2, USART2 Transmit Pin.

Table 60. 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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