ATMEGA644 datasheet(76/374 Pages) ATMEL

76 / 374 page

2593L–AVR–02/07

ATmega644

• Bit 4 – PUD: Pull-up Disable

When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and

PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See ”Con-

figuring the Pin” on page 69 for more details about this feature.

12.3.2

Alternate Functions of Port A

The Port A has an alternate function as the address low byte and data lines for the External

Memory Interface.

• ADC7:0/PCINT7:0 – Port A, Bit 7:0

ADC7:0, Analog to Digital Converter, Channels 7:0.

PCINT7:0, Pin Change Interrupt source 7:0: The PA7:0 pins can serve as external interrupt

sources.

Table 12-3.

Port A Pins Alternate Functions

Port Pin

Alternate Function

PA7

ADC7 (ADC input channel 7)

PCINT7 (Pin Change Interrupt 7)

PA6

ADC6 (ADC input channel 6)

PCINT6 (Pin Change Interrupt 6)

PA5

ADC5 (ADC input channel 5)

PCINT5 (Pin Change Interrupt 5)

PA4

ADC4 (ADC input channel 4)

PCINT4 (Pin Change Interrupt 4)

PA3

ADC3 (ADC input channel 3)

PCINT3 (Pin Change Interrupt 3)

PA2

ADC2 (ADC input channel 2)

PCINT2 (Pin Change Interrupt 2)

PA1

ADC1 (ADC input channel 1)

PCINT1 (Pin Change Interrupt 1)

PA0

ADC0 (ADC input channel 0)

PCINT0 (Pin Change Interrupt 0)

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