ATAM862 datasheet(40/110 Pages) ATMEL

40 / 110 page

4554E–4BMCU–05/06

ATAM862-3

22.4

Bi-directional Port 4

The bi-directional Port 4 is a bitwise configurable I/O port and provides the external pins for the

Timer 2, SSI and the voltage monitor input (VMI). As a normal port, it performs in exactly the

same way as bi-directional Port 2 (see Figure 22-5). Two additional multiplexes allow data and

port direction control to be passed over to other internal modules (Timer 2, VM or SSI). The

I/O-pins for SC and SD line have an additional mode to generate an SSI-interrupt.

All four Port 4 pins can be individually switched by the P4CR register. Figure 22-5 shows the

internal interfaces to bi-directional Port 4.

Figure 22-5. Bi-directional Port 4 and Port 6

22.4.1

Port 4 Data Register (P4DAT)

Primary register address: "4"hex

22.4.2

Port 4 Control Register (P4CR) Byte Write

Auxiliary register address: "4"hex

P4xM2, P4xM1 – Port 4x Interrupt mode/direction code

Master reset

BPxy

Configurable

PxDATy

I/O Bus

Switched

pull-up

Switched

pull-down

PxCRy

PxMRy

POut

(Direction)

PDir

Intx

Static

pull-up

Static

pull-down

Bit 3Bit 2Bit 1Bit 0

P4DAT3

P4DAT2

P4DAT1

P4DAT0

Reset value: 1111b

Bit 3Bit 2Bit 1Bit 0

First write cycle

P41M2

P41M1

P40M2

P40M1

Reset value: 1111b

Bit 7Bit 6Bit 5Bit 4

Second write cycle

P43M2

P43M1

P42M2

P42M1

Reset value: 1111b

ATAM862 Datasheet(PDF) 40 Page - ATMEL Corporation

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