ATMEGA161-4AI datasheet(85/134 Pages) ATMEL

85 / 134 page

ATmega161(L)

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, and 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 8 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 con-

figured as an output pin. If DDCn is cleared (zero), PCn is configured as an input pin. If PORTCn is set (one) when the pin

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 C pins are tri-stated when a reset condition

becomes active, even if the clock is not running.

n: 7, 6,…0, pin number

Port C Schematics

Note that all port pins are synchronized. The synchronization latch is however, not shown in the figure.

Bit

654

321

$15 ($35)

PORTC7

PORTC6

PORTC5

PORTC4

PORTC3

PORTC2

PORTC1

PORTC0

PORTC

Read/Write

R/W

Initial value

Bit

654

321

$14 ($34)

DDC7

DDC6

DDC5

DDC4

DDC3

DDC2

DDC1

DDC0

DDRC

Read/Write

R/W

Initial value

Bit

654

321

$13 ($33)

PINC7

PINC6

PINC5

PINC4

PINC3

PINC2

PINC1

PINC0

PINC

Read/Write

RRR

Initial value

Hi-Z

Table 31. DDCn Effects on Port C Pins

DDCn

PORTCn

I/O

Pull-up

Comment

Input

Tri-state (Hi-Z)

Input

Yes

PCn will source current if ext. pulled low.

Output

Push-pull Zero Output

Output

Push-pull One Output

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