ATMEGA48 datasheet(84/374 Pages) ATMEL

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2545J–AVR–12/06

ATmega48/88/168

12.3.3

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 12-9.

The alternate pin configuration is as follows:

• AIN1/OC2B/PCINT23 – Port D, Bit 7

AIN1, Analog Comparator Negative Input. Configure the port pin as input with the internal pull-up

switched off to avoid the digital port function from interfering with the function of the Analog

Comparator.

PCINT23: Pin Change Interrupt source 23. The PD7 pin can serve as an external interrupt

source.

• AIN0/OC0A/PCINT22 – Port D, Bit 6

AIN0, Analog Comparator Positive Input. Configure the port pin as input with the internal pull-up

switched off to avoid the digital port function from interfering with the function of the Analog

Comparator.

OC0A, Output Compare Match output: The PD6 pin can serve as an external output for the

Timer/Counter0 Compare Match A. The PD6 pin has to be configured as an output (DDD6 set

(one)) to serve this function. The OC0A pin is also the output pin for the PWM mode timer

function.

PCINT22: Pin Change Interrupt source 22. The PD6 pin can serve as an external interrupt

source.

Table 12-9.

Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

AIN1 (Analog Comparator Negative Input)

PCINT23 (Pin Change Interrupt 23)

PD6

AIN0 (Analog Comparator Positive Input)

OC0A (Timer/Counter0 Output Compare Match A Output)

PCINT22 (Pin Change Interrupt 22)

PD5

T1 (Timer/Counter 1 External Counter Input)

OC0B (Timer/Counter0 Output Compare Match B Output)

PCINT21 (Pin Change Interrupt 21)

PD4

XCK (USART External Clock Input/Output)

T0 (Timer/Counter 0 External Counter Input)

PCINT20 (Pin Change Interrupt 20)

PD3

INT1 (External Interrupt 1 Input)

OC2B (Timer/Counter2 Output Compare Match B Output)

PCINT19 (Pin Change Interrupt 19)

PD2

INT0 (External Interrupt 0 Input)

PCINT18 (Pin Change Interrupt 18)

PD1

TXD (USART Output Pin)

PCINT17 (Pin Change Interrupt 17)

PD0

RXD (USART Input Pin)

PCINT16 (Pin Change Interrupt 16)

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