Rainbow-electronics AT90LS4433 Bedienungsanleitung PDF herunterladen (Seite 80)

AT90S/LS4433

1042G–AVR–09/02

Port D Port D is an 8-bit bi-directional I/O port with internal pull-up resistors.

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

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.

The Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally

pulled low will source current if the pull-up resistors are activated.

Some Port D pins have alternate functions as shown in Table 26.

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; 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 26. Port D Pin Alternate Functions

Port Pin Alternate Function

PD0 RXD (UART Input Line)

PD1 TXD (UART Output Line)

PD2 INT0 (External Interrupt 0 Input)

PD3 INT1 (External Interrupt 1 Input)

PD4 T0 (Timer/Counter 0 External Counter Input)

PD5 T1 (Timer/Counter 1 External Counter Input)

PD6 AIN0 (Analog Comparator Positive Input)

PD7 AIN1 (Analog Comparator Negative Input)

Bit 76543210

$12 ($32)

PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 PORTD

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

InitialValue00000000

Bit 76543210

$11 ($31) DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 DDRD

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

InitialValue00000000

Bit 76543210

$10 ($30) PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 PIND

Read/Write R R R RRRRR

Initial Value N/A N/A N/A N/A N/A N/A N/A N/A

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 124 125

Keine Kommentare

Rainbow-electronics AT90LS4433 Bedienungsanleitung Seite 80