AT90LS4433-4AI datasheet(78/126 Pages) ATMEL

78 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Port C Data Register – PORTC

Port C Data Direction Register

– DDRC

Port C Input Pins Address –

PINC

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

the physical value on each Port C pin. When reading PORTC, the Port C Data Latch is

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

Port C as General Digital I/O

All six pins in Port C have equal functionality when used as digital I/O pins.

PCn, general I/O pin: The DDCn bit in the DDRC Register selects the direction of this

pin. If DDCn is set (one), PCn is configured as an output pin. If DDCn is cleared (zero),

PCn is configured as an input pin. If PORTCn is set (one) when the pin is configured as

an input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off,

PORTCn 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:

1. n: 5..0, pin number

Bit

76543210

$15 ($35)

–

PORTC5

PORTC4

PORTC3

PORTC2

PORTC1

PORTC0

PORTC

Read/Write

R/W

Initial Value

00000000

Bit

76543210

$14 ($34)

–

DDC5

DDC4

DDC3

DDC2

DDC1

DDC0

DDRC

Read/Write

R/W

Initial Value

00000000

Bit

76543210

$13 ($33)

–

PINC5

PINC4

PINC3

PINC2

PINC1

PINC0

PINC

Read/Write

RRRRRRRR

Initial Value

N/A

Table 25. DDCn Effects on Port C Pins

(1)

DDCn

PORTCn

I/O

Pull-up

Comment

Input

Tri-state (high-Z)

Input

Yes

PCn will source current if ext. pulled low.

Output

Push-pull Zero Output

Output

Push-pull One Output

AT90LS4433-4AI Datasheet(PDF) 78 Page - ATMEL Corporation

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