ATmega32A datasheet(64/352 Pages) ATMEL

64 / 352 page

8155B–AVR–07/09

ATmega32A

Note:

1. When enabled, the Two-wire Serial Interface enables slew-rate controls on the output pins

PC0 and PC1. This is not shown in the figure. In addition, spike filters are connected between

the AIO outputs shown in the port figure and the digital logic of the TWI module.

12.3.4

Alternate Functions of Port D

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

The alternate pin configuration is as follows:

• OC2 – Port D, Bit 7

OC2, Timer/Counter2 Output Compare Match output: The PD7 pin can serve as an external out-

put for the Timer/Counter2 Output Compare. The pin has to be configured as an output (DDD7

set (one)) to serve this function. The OC2 pin is also the output pin for the PWM mode timer

function.

• ICP1 – Port D, Bit 6

ICP1 – Input Capture Pin: The PD6 pin can act as an Input Capture pin for Timer/Counter1.

• OC1A – Port D, Bit 5

Table 12-11. Overriding Signals for Alternate Functions in PC3:PC0(1)

Signal

Name

PC3/TMS

PC2/TCK

PC1/SDA

PC0/SCL

PUOE

JTAGEN

TWEN

PUOV

PORTC1 • PUD

PORTC0 • PUD

DDOE

JTAGENJTAGENTWEN

TWEN

DDOV

SDA_OUT

SCL_OUT

PVOE

TWEN

PVOV

DIEOE

JTAGENJTAGEN0

DIEOV

–

AIO

TMS

TCK

SDA INPUT

SCL INPUT

Table 12-12. Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

OC2 (Timer/Counter2 Output Compare Match Output)

PD6

ICP1 (Timer/Counter1 Input Capture Pin)

PD5

OC1A (Timer/Counter1 Output Compare A Match Output)

PD4

OC1B (Timer/Counter1 Output Compare B Match Output)

PD3

INT1 (External Interrupt 1 Input)

PD2

INT0 (External Interrupt 0 Input)

PD1

TXD (USART Output Pin)

PD0

RXD (USART Input Pin)

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