ATmega328P datasheet(90/448 Pages) ATMEL

90 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

• INT0/PCINT18 – Port D, Bit 2

INT0, External Interrupt source 0: The PD2 pin can serve as an external interrupt source.

PCINT18: Pin Change Interrupt source 18. The PD2 pin can serve as an external interrupt

source.

• TXD/PCINT17 – Port D, Bit 1

TXD, Transmit Data (Data output pin for the USART). When the USART Transmitter is enabled,

this pin is configured as an output regardless of the value of DDD1.

PCINT17: Pin Change Interrupt source 17. The PD1 pin can serve as an external interrupt

source.

• RXD/PCINT16 – Port D, Bit 0

RXD, Receive Data (Data input pin for the USART). When the USART Receiver is enabled this

pin is configured as an input regardless of the value of DDD0. When the USART forces this pin

to be an input, the pull-up can still be controlled by the PORTD0 bit.

PCINT16: Pin Change Interrupt source 16. The PD0 pin can serve as an external interrupt

source.

Table 13-10 and Table 13-11 relate the alternate functions of Port D to the overriding signals

shown in Figure 13-5 on page 80.

Table 13-10. Overriding Signals for Alternate Functions PD7..PD4

Signal

Name

PD7/AIN1

/PCINT23

PD6/AIN0/

OC0A/PCINT22

PD5/T1/OC0B/

PCINT21

PD4/XCK/

T0/PCINT20

PUOE

000

PUO

000

DDOE

DDOV

PVOE

OC0A ENABLE

OC0B ENABLE

UMSEL

PVOV

OC0A

OC0B

XCK OUTPUT

DIEOE

PCINT23 • PCIE2

PCINT22 • PCIE2

PCINT21 • PCIE2

PCINT20 • PCIE2

DIEOV

111

PCINT23 INPUT

PCINT22 INPUT

PCINT21 INPUT

T1 INPUT

PCINT20 INPUT

XCK INPUT

T0 INPUT

AIO

AIN1 INPUT

AIN0 INPUT

–

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