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PCL-734 User Manual 16

A.1 Register Format

Programming the PCL-734 is extremely simple. Each output channel corresponds to

a bit in the card's registers. To turn on an output channel you write a ‘‘1” to the corre-

sponding bit.

The card requires four I/O register addresses. The address of each register is speci-

fied as an offset from the card's base address. For example, BASE+0 is the card's

base address and BASE+2 is the base address + two bytes. If the card's base

address is 300h, the register's address is 302h. See Chapter 2 for information on set-

ting the card's base address.

Table A.1: Register Assignment

Address Write Read

BASE + 0 IDO bits 0-7 N/A

BASE + 1 IDO bits 8-15 N/A

BASE + 2 IDO bits 16-23 N/A

BASE + 3 IDO bits 24-31 N/A

1 2 ... 19 20 21 22 23 24 25 26 27 28

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