Caple CM109 User Manual download pdf (Page 65)

BDM-610000082 Rev A Chapter 4: Using the cpuModule 57

Clear Register:

A read to this register Clears the IRQs and a write to this register sets the DIO-Compare, DIO- Mask,

DIO-Control, Port 1, and Port 0 to zeros. A write to this register is used to clear the board.

Port 0 Direction Register:

Writing a zero to a bit in this register makes the corresponding pin of the aDIO connector an input. Writing

a one to a bit in this register makes the corresponding pin of the aDIO connector an output.

Mask Register:

Writing a zero to a bit in this register will not mask off the corresponding bit in the DIO-Compare register.

Writing a one to a bit in this register masks off the corresponding bit in the DIO-Compare register. When all

bits are masked off the aDIOs comparator is disabled. This condition means Event and Match mode will not

generate an interrupt. This register is used by Event and Match modes.

Compare Register:

A Read/Write register used for Match Mode. Bit values in this register that are not masked off are compared

against the value on Port 0. A Match or Event causes bit 6 of DIO-Control to be set and if the aDIO is in

Advanced interrupt mode, the Match or Event causes an interrupt.

Table 37 DIO-Control I/O Address EC3h—Read Access

D7 D6 D5 D4 D3 D2 D1 D0

Table 38 DIO-Control I/O Address EC3h—Write Access

D7 D6 D5 D4 D3 D2 D1 D0

Table 39 Multi-Function at Address EC2h

1. Contents based on bits D0 and D1 of DIO-Control.

XXXXXXXX

I/O I/O I/O I/O I/O I/O I/O I/O

M7 M6 M5 M4 M3 M2 M1 M0

C7 C6 C5 C4 C3 C2 C1 C0

Strobe 0 Status

0 = no strobe

1 = strobe

Digital IRQ Status

0 = no digital interrupt

1 = digital interrupt

Strobe 1 Status

0 = no strobe

1 = strobe

Digital IRQ Mode

00 = Disabled

01 = strobe Mode

10 = event mode

11 = match mode

Port 1 Direction

0 = input

1 = output

Multi-Function

00 = clear mode

01 = port 0 direction

10 = mask register

11 = compare register

Multi-Function

00 = clear mode

01 = port 0 direction

10 = mask register

11 = compare register

Port 1 Direction

0 = input

1 = output

Reserved

read/write 00 clear

0 in, 1 out 01 Port 0 direction

0 no mask, 1 mask 10 DIO mask

read/write 11 compare

Digital IRQ Mode

00 = Disabled

01 = strobe Mode

10 = event mode

11 = match mode

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 101 102

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Caple CM109 User Manual Page 65

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