AT43USB325 datasheet(58/109 Pages) ATMEL

58 / 109 page

3355C–USB–4/05

AT43USB325

7.3

Port C

Port C is an 8-bit bi-directional I/O port with an internal pull-up resistor at each pin. Port C is

designed for use as the row inputs of a keyboard controller. Its output buffers can sink 4 mA.

Three I/O memory address locations are allocated for the Port C, one each for the Data Register

- PORTC, $15($35), Data Direction Register - DDRC, $14($34) and the Port C Input Pins –

PINC, $13($33). The Port C Input Pin’s address is read only, while the Data Register and the

Data Direction Register are read/write.

7.3.1

Port C Data Register – PORTC

7.3.2

Port C Data Direction Register – DDRC

7.3.3

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.

Bit

432

$15 ($35)

PORTC7

PORTC6

PORTC5

PORTC4

PORTC3

PORTC2

PORTC1

PORTC0

PORTC

Read/Write

R/W

Initial Value

Bit

$14 ($34)

DDC7

DDC6

DDC5

DDC4

DDC3

DDC2

DDC1

DDC0

DDRC

Read/Write

R/W

Initial Value

Bit

$13 ($33)

PINC7

PINC6

PINC5

PINC4

PINC3

PINC2

PINC1

PINC0

PINC

Read/Write

Initial Value

N/A

AT43USB325 Datasheet(PDF) 58 Page - ATMEL Corporation

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