ATMEGA640 datasheet(90/436 Pages) MICROCHIP

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

DS40002211A

13.3.9

Alternate Functions of Port J

The Port J alternate pin configuration is as follows:

• PCINT15:12 - Port J, Bit 6:3

PCINT15:12, Pin Change Interrupt Source 15:12. The PJ6:3 pins can serve as External Interrupt Sources.

• XCK2/PCINT11 - Port J, Bit 2

XCK2, USART 2 External Clock. The Data Direction Register (DDJ2) controls whether the clock is output (DDJ2

set) or input (DDJ2 cleared). The XCK2 pin is active only when the USART2 operates in synchronous mode.

PCINT11, Pin Change Interrupt Source 11. The PJ2 pin can serve as External Interrupt Sources.

• TXD3/PCINT10 - Port J, Bit 1

TXD3, USART3 Transmit pin.

PCINT10, Pin Change Interrupt Source 10. The PJ1 pin can serve as External Interrupt Sources.

Table 13-26. Overriding Signals for Alternate Functions in PH3:PH0

Signal Name

PH3/OC4A

PH2/XCK2

PH1/TXD2

PH0/RXD2

PUOE

TXEN2

RXEN2

PUOV

000

PORTH0 • PUD

DDOE

XCK2 OUTPUT

ENABLE

TXEN2

RXEN2

DDOV

0110

PVOE

OC4A ENABLE

XCK2 OUTPUT

ENABLE

TXEN2

PVOV

OC4A

XCK2

TXD2

PTOE

––––

DIEOE

0000

DIEOV

0000

XC2K INPUT

RXD2

AIO

––––

Table 13-27. Port J Pins Alternate Functions

Port Pin

Alternate Function

PJ7

–

PJ6

PCINT15 (Pin Change Interrupt 15)

PJ5

PCINT14 (Pin Change Interrupt 14)

PJ4

PCINT13 (Pin Change Interrupt 13)

PJ3

PCINT12 (Pin Change Interrupt 12)

PJ2

XCK3/PCINT11 (USART3 External Clock or Pin Change Interrupt 11)

PJ1

TXD3/PCINT10 (USART3 Transmit Pin or Pin Change Interrupt 10)

PJ0

RXD3/PCINT9 (USART3 Receive Pin or Pin Change Interrupt 9)

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