AT43USB355 datasheet(70/115 Pages) ATMEL

70 / 115 page

AT43USB355

2603G–USB–04/06

Port D

Port D is an 8-bit bi-directional I/O port. Its output buffers can sink or source 2 mA.

Three I/O memory address locations are allocated for the Port D, one each for the Data Regis-

ter - PORTD, $12($32), Data Direction Register (DDRD), $11($31) and the Port D Input Pins

(PIND), $10($30). The Port D Input Pins address is read only, while the Data Register and the

Data Direction Register are read/write.

All port pins have individually selectable pull-up resistors. When pins PD0 to PD7 are used as

inputs and are externally pulled low, they will source current if the internal pull-up resistors are

activated

Some Port D pins have alternate functions as shown in Table 27.

When the pins are used for the alternate function the DDRD and PORTD register has to be set

according to the alternate function description.

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, and 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.

Table 27. Port D Alternate Functions

Port Pin

Alternate Function

PD2

INT0, External Interrupt 0

PD3

INT1, External Interrupt 1

PD5

OC1A Timer/Counter1 Output Compare A

PD6

OC1B Timer/Counter1 Output Compare B

Bit

$12 ($32)

PORTD7

PORTD6

PORTD5

PORTD4

PORTD3

PORTD2

PORTD1

PORTD0

PORTD

Read/Write

R/W

Initial Value

Bit

654

$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

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