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Write register BASE+10 enables or disables the PCL-818L's timer/
counter
Bit
Value
TC0
TC1
The four registers located at addresses BASE+12, BASE+13,
BASE+14 and BASE+15 are used for the Intel 8254 programmable
timer/counter. Please refer to Chapter 8 or 8254 product literature for
detailed application information.
36
PCL-818L User's Manual
D7
D6
D5
X
X
X
Disable/enable pacer
0
Pacer enabled
1
Pacer controlled by TRIG0. This blocks trigger
pulses sent from the pacer to the A/D until TRIG0 is
taken high.
Counter 0 input source mode
0
Sets Counter 0 to accept external clock pulses
1
Connects Counter 0 internally to a 100 KHz clock
source
D4
D3
D2
X
X
X
D1
D0
TC1
TC0
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