T48C862-R4 datasheet(37/107 Pages) ATMEL

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T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

Table 11.

Port 5 Control Register

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 32). Two additional multi-

plexes 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 32 shows

the internal interfaces to bi-directional Port 4.

Figure 32.

Bi-directional Port 4 and Port 6

Auxiliary Address: "5"hex, First Write Cycle

Second Write Cycle

Code

3 2 1 0

Function

Code

3 2 1 0

Function

x x 1 1

BP50 in input mode

– interrupt disabled

x x 1 1

BP52 in input mode

– interrupt disabled

x x 0 1

BP50 in input mode

– rising edge interrupt

x x 0 1

BP52 in input mode

– rising edge interrupt

x x 1 0

BP50 in input mode

– falling edge interrupt

x x 1 0

BP52 in input mode

– falling edge interrupt

x x 0 0

BP50 in output mode

– interrupt disabled

x x 0 0

BP52 in output mode

– interrupt disabled

1 1 x x

BP51 in input mode

– interrupt disabled

1 1 x x

BP53 in input mode

– interrupt disabled

0 1 x x

BP51 in input mode

– rising edge interrupt

0 1 x x

BP53 in input mode

– rising edge interrupt

1 0 x x

BP51 in input mode

– falling edge interrupt

1 0 x x

BP53 in input mode

– falling edge interrupt

0 0 x x

BP51 in output mode

– interrupt disabled

0 0 x x

BP53 in output mode

– interrupt disabled

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

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