AT90LS8535-4AI datasheet(87/127 Pages) ATMEL

87 / 127 page

AT90S/LS8535

1041H–11/01

Port D Data Register – PORTD

Port D Data Direction Register

– DDRD

Port D Input Pins Address –

PIND

The Port D Input Pins address (PIND) is not a register; this address enables access to

the physical value on each Port D pin. When reading PORTD, the Port D Data Latch is

read and when reading PIND, the logical values present on the pins are read.

Port D As General Digital I/O

PDn, general I/O pin: The DDDn bit in the DDRD register selects the direction of this pin.

If DDDn is set (one), PDn is configured as an output pin. If DDDn is cleared (zero), PDn

is configured as an input pin. If PDn is set (one) when configured as an input pin, the

MOS pull-up resistor is activated. To switch the pull-up resistor off, the PDn has to be

cleared (zero) or the pin has to be configured as an output pin.The port pins are tri-

stated when a reset condition becomes active, even if the clock is not running.

Note:

n: 7,6…0, pin number.

Alternate Functions of Port D

• OC2 – Port D, Bit 7

OC2, Timer/Counter2 output compare match output: The PD7 pin can serve as an

external output for the Timer/Counter2 output compare. The pin has to be configured as

an output (DDD7 set [one]) to serve this function. See the timer description on how to

enable this function. The OC2 pin is also the output pin for the PWM mode timer

function.

• ICP – Port D, Bit 6

IC P – Input Capture Pin: Th e PD6 pin can act as an input capture pin for

Timer/Counter1. The pin has to be configured as an input (DDD6 cleared [zero]) to

serve this function. See the timer description on how to enable this function.

Bit

$12 ($32)

PORTD7

PORTD6

PORTD5

PORTD4

PORTD3

PORTD2

PORTD1

PORTD0

PORTD

Read/Write

R/W

Initial Value

Bit

$11 ($31)

DDD7

DDD6

DDD5

DDD4

DDD3

DDD2

DDD1

DDD0

DDRD

Read/Write

R/W

Initial Value

Bit

$10 ($30)

PIND7

PIND6

PIND5

PIND4

PIND3

PIND2

PIND1

PIND0

PIND

Read/Write

Initial Value

N/A

Table 34. DDDn Bits on Port D Pins

DDDn

PORTDn

I/O

Pull-up

Comment

Input

Tri-state (high-Z)

Input

Yes

PDn will source current if ext. pulled low

Output

Push-pull Zero Output

Output

Push-pull One Output

AT90LS8535-4AI Datasheet(PDF) 87 Page - ATMEL Corporation

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