ATmega162-16AI datasheet(78/324 Pages) ATMEL

78 / 324 page

2513K–AVR–07/09

ATmega162/V

Alternate Functions of

Port D

The Port D pins with alternate functions are shown in Table 38.

The alternate pin configuration is as follows:

•RD – Port D, Bit 7

RD is the external data memory read control strobe.

•WR – Port D, Bit 6

WR is the external data memory write control strobe.

• TOSC2/OC1A – Port D, Bit 5

TOSC2, Timer Oscillator pin 2: When the AS2 bit in ASSR is set (one) to enable asynchronous

clocking of Timer/Counter2, pin PD5 is disconnected from the port, and becomes the inverting

output of the Oscillator amplifier. In this mode, a crystal Oscillator is connected to this pin, and

the pin can not be used as an I/O pin.

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.

Table 38. Port D Pins Alternate Functions

Port Pin

Alternate Function

PD7

RD (Read strobe to external memory)

PD6

WR (Write strobe to external memory)

PD5

TOSC2 (Timer Oscillator Pin 2)

OC1A (Timer/Counter1 Output Compare A Match Output)

PD4

TOSC1 (Timer Oscillator Pin 1)

XCK0 (USART0 External Clock Input/Output)

OC3A (Timer/Counter3 Output Compare A Match Output)

PD3

INT1 (External Interrupt 1 Input)

ICP3 (Timer/Counter3 Input Capture Pin)

PD2

INT0 (External Interrupt 0 Input)

XCK1 (USART1 External Clock Input/Output)

PD1

TXD0 (USART0 Output Pin)

PD0

RXD0 (USART0 Input Pin)

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