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Copyright 2001 Diamond Systems Corp. Ruby-MM-1612 User Manual V1.1 P. 11
Base + 3, Write: External trigger register
Bit No. 7 6 5 4 3 2 1 0
Name X X X X X X X TRIGEN
X Bit not used. These bits will be ignored.
TRIGEN External trigger enable. 1 = enable, 0 = disable. When external trigger is enabled, digital
I/O line C0 will update all DACs simultaneously when it is brought low. This can be done
either by an external signal, when C0 is in input mode, or in software, when C0 is in
output mode.
If using an external trigger, make sure that the lower half of Port C is in input mode.
Base + 4 through Base + 7 Read/Write 82C55 Digital I/O Registers
These registers map directly to the 82C55 digital I/O chip. The definitions of these registers can be found
in the 82C55 datasheet appended to the back of this manual. A short form description is on the next
page.
These lines power up in input mode. Each line has a 10KΩ pull-up resistor, so on power-up or system
reset, all lines will indicate a logic high.