Rainbow-electronics ATAR862-8 User Manual download pdf (Page 37)

ATAR862-8

4589B–4BMCU–02/03

Table 7. P5xM2, P5xM1 – Port 5x Interrupt Mode/Direction Code

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 25). 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 gen-

erate an SSI-interrupt.

All four Port 4 pins can be individually switched by the P4CR-register. Figure 25 shows

the internal interfaces to bi-directional Port 4.

Figure 33. 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

Mask options

PxDATy

I/O Bus

Switched

pull-up

Switched

pull-down

PxCRy

PxMRy

POut

(Direction)

PDir

Intx

Static

pull-up

Static

pull-down

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 37

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