ATAM894 datasheet(27/97 Pages) ATMEL

27 / 97 page

4679D–4BMCU–05/05

ATAM894

6.2.3

Bi-directional Port 5

As all other bi-directional ports, this port includes a bit-wise-programmable Control Register

(P5CR), which allows the individual programming of each port bit as input or output. It also

opens up the possibility of reading the pin condition when in output mode. This is a useful fea-

ture for self-testing and for serial bus applications.

The port pins can also be used as external interrupt inputs (see Figure 6-4 on page 27 and Fig-

ure 6-5 on page 27). The interrupts (INT1 and INT6) can be masked or independently configured

to trigger on either edge. The interrupt configuration and port direction is controlled by the Port 5

Control Register (P5CR). An additional low resistance pull-up/-down transistor mask option pro-

vides an internal bus pull-up for serial bus applications.

The Port 5 Data Register (P5DAT) is I/O mapped to the primary address register of address '5'h

and the Port 5 Control Register (P5CR) to the corresponding auxiliary register. The P5CR is a

byte-wide register and is configured by writing first the low nibble and then the high nibble (see

section ”Addressing Peripherals” on page 22).

Figure 6-4.

Bi-directional Port 5

Figure 6-5.

Port 5 External Interrupts

Master reset

BP5y

(1) Flash options

P5DATy

I/O Bus

IN enable

I/O Bus

(1)

Switched

pull-up

Switched

pull-down

Static

pull-up

(Data out)

Static

pull-down

(1)

Bidir. Port

Data in

IN_Enable

BP53

P53M2

P53M1

P52M2

P52M1

P51M2

P51M1

P50M2

P50M1

Decoder

Bidir. Port

Data in

IN_Enable

BP52

I/O-bus

Bidir. Port

Data in

IN_Enable

BP5

I/O-bus

Bidir. Port

Data in

IN_Enable

BP5

INT1

INT6

P5CR:

1376

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