ATMEGA640 datasheet(89/436 Pages) MICROCHIP

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

DS40002211A

• OC4B – Port H, Bit 4

OC4B, Output Compare Match B output: The PH4 pin can serve as an external output for the Timer/Counter2 Out-

put 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 Out-

put 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 operates in synchronous mode.

• TXD2 – Port H, Bit 1

TXD2, USART2 Transmit Pin.

• RXD2 – Port H, Bit 0

RXD2, USART2 Receive pin: Receive Data (Data input pin for the USART2). When the USART2 Receiver is

enabled, this pin is configured as an input regardless of the value of DDH0. When the USART2 forces this pin to be

an input, a logical on in PORTH0 will turn on the internal pull-up.

Table 13-25. Overriding Signals for Alternate Functions in PH7:PH4

Signal Name

PH7/T4

PH6/OC2B

PH5/OC4C

PH4/OC4B

PUOE

0000

PUOV

0000

DDOE

0000

DDOV

0000

PVOE

OC2B ENABLE

OC4C ENABLE

OC4B ENABLE

PVOV

OC2B

OC4C

OC4B

PTOE

––––

DIEOE

0000

DIEOV

0000

T4 INPUT

000

AIO

––––

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