ATtiny88 datasheet(70/266 Pages) ATMEL

70 / 266 page

8008C–AVR–03/09

ATtiny48/88

10.3.4

Alternate Functions of Port D

The Port D pins with alternate functions are shown in Table 10-11.

The alternate pin configuration is as follows:

• AIN1/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/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.

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

source.

• T1/PCINT21 – Port D, Bit 5

T1: Timer/Counter1 counter source.

PCINT21: Pin Change Interrupt source 21. The PD5 pin can serve as an external interrupt

source.

• T0/PCINT20 – Port D, Bit 4

T0: Timer/Counter0 counter source.

PCINT20: Pin Change Interrupt source 20. The PD4 pin can serve as an external interrupt

source.

Table 10-11. 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)

PCINT22 (Pin Change Interrupt 22)

PD5

T1 (Timer/Counter 1 External Counter Input)

PCINT21 (Pin Change Interrupt 21)

PD4

T0 (Timer/Counter 0 External Counter Input)

PCINT20 (Pin Change Interrupt 20)

PD3

INT1 (External Interrupt 1 Input)

PCINT19 (Pin Change Interrupt 19)

PD2

INT0 (External Interrupt 0 Input)

PCINT18 (Pin Change Interrupt 18)

PD1

PCINT17 (Pin Change Interrupt 17)

PD0

PCINT16 (Pin Change Interrupt 16)

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