AT43USB325 datasheet(59/109 Pages) ATMEL

59 / 109 page

3355C–USB–4/05

AT43USB325

7.4

Port D

Port D is a 7-bit bi-directional I/O port.

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

- 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. Some Port D pins have alternate functions as shown in

the following table:

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

according to the alternate function description.

7.4.1

Port D Data Register – PORTD

7.4.2

Port D Data Direction Register – DDRD

7.4.3

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 7-2.

Port D Pins Alternate Functions

Port Pin

Alternate Function

PD1

T1 (Timer/Counter1 External Counter Input)

PD3

INT1 (External Interrupt 1 Input)

PD4

INTA (External Interrupt A Input)

PD5

INTB (External Interrupt B Input)

PD6

INTC (External Interrupt C Input)

PD7

INTD (External Interrupt D Input)

Bit

$12 ($32)

PORTD7

PORTD6

PORTD5

PORTD4

PORTD3

–

PORTD1

PORTD0

PORTD

Read/Write

R/W

–

R/W

Initial Value

Bit

$11 ($31)

DDD7

DDD6

DDD5

DDD4

DDD3

–

DDD1

DDD0

DDRD

Read/Write

R/W

–

R/W

Initial Value

Bit

$10 ($30)

PIND7

PIND6

PIND5

PIND4

PIND3

–

PIND1

PIND0

PIND

Read/Write

–

Initial Value

N/A

AT43USB325 Datasheet(PDF) 59 Page - ATMEL Corporation

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