ATmega32A datasheet(65/352 Pages) ATMEL

65 / 352 page

8155B–AVR–07/09

ATmega32A

OC1A, Output Compare Match A output: The PD5 pin can serve as an external output for the

Timer/Counter1 Output Compare A. The pin has to be configured as an output (DDD5 set (one))

to serve this function. The OC1A pin is also the output pin for the PWM mode timer function.

• OC1B – Port D, Bit 4

OC1B, Output Compare Match B output: The PD4 pin can serve as an external output for the

Timer/Counter1 Output Compare B. The pin has to be configured as an output (DDD4 set (one))

to serve this function. The OC1B pin is also the output pin for the PWM mode timer function.

• INT1 – Port D, Bit 3

INT1, External Interrupt Source 1: The PD3 pin can serve as an external interrupt source.

• INT0 – Port D, Bit 2

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

•TXD – 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.

• RXD – 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.

Table 12-13 and Table 12-14 relate the alternate functions of Port D to the overriding signals

shown in Figure 12-5 on page 56.

Table 12-13. Overriding Signals for Alternate Functions PD7:PD4

Signal Name

PD7/OC2

PD6/ICP1

PD5/OC1A

PD4/OC1B

PUOE

PUOV

DDOE

DDOV

PVOE

OC2 ENABLE

OC1A ENABLE

OC1B ENABLE

PVOV

OC2

OC1A

OC1B

DIEOE

DIEOV

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ICP1 INPUT

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AIO

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