ATMEGA644 datasheet(81/374 Pages) ATMEL

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2593L–AVR–02/07

ATmega644

12.3.4

Alternate Functions of Port C

The Port C alternate function is as follows:

• TOSC2/PCINT23 – Port C, Bit7

TOSC2, Timer Oscillator pin 2. The PC7 pin can serve as an external interrupt source to the

MCU.

PCINT23, Pin Change Interrupt source 23: The PC7 pin can serve as an external interrupt

source.

• TOSC1/PCINT22 – Port C, Bit 6

TOSC1, Timer Oscillator pin 1. The PC6 pin can serve as an external interrupt source to the

MCU.

PCINT22, Pin Change Interrupt source 23: The PC6 pin can serve as an external interrupt

source.

• TDI/PCINT21 – Port C, Bit 5

TDI, JTAG Test Data Input.

PCINT21, Pin Change Interrupt source 21: The PC5 pin can serve as an external interrupt

source.

• TDO/PCINT20 – Port C, Bit 4

TDO, JTAG Test Data Output.

PCINT20, Pin Change Interrupt source 20: The PC4 pin can serve as an external interrupt

source.

Table 12-9.

Port C Pins Alternate Functions

Port Pin

Alternate Function

PC7

TOSC2 (Timer Oscillator pin 2)

PCINT23 (Pin Change Interrupt 23)

PC6

TOSC1 (Timer Oscillator pin 1)

PCINT22 (Pin Change Interrupt 22)

PC5

TDI (JTAG Test Data Input)

PCINT21 (Pin Change Interrupt 21)

PC4

TDO (JTAG Test Data Output)

PCINT20 (Pin Change Interrupt 20)

PC3

TMS (JTAG Test Mode Select)

PCINT19 (Pin Change Interrupt 19)

PC2

TCK (JTAG Test Clock)

PCINT18 (Pin Change Interrupt 18)

PC1

SDA (2-wire Serial Bus Data Input/Output Line)

PCINT17 (Pin Change Interrupt 17)

PC0

SCL (2-wire Serial Bus Clock Line)

PCINT16 (Pin Change Interrupt 16)

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