Specifications

TIMER CONTROL OF AID
The following BASIC program:
SETS UP COUNTER 5 OF THE TIMER TO PUT OUT A PULSE ONCE PER SECOND
AT OUT 5. AND THEN CONTINUOUSLY CHECKS THE AID STATUS TO CHECK FOR
A "DONE" (END OF CONVERSION) TO USE THIS OPTION.
A jumper must be connected between OUT 5 (Pin 4. connector P3) and
the external trigger input (Pin 3. connector P3) located on the mother
board. The source of counter 5 ;s selected as F5. a 100 Hz. square
wave. Counter 5 counts from an initial value of 0099 down to 0000
which takes exactly one second sioce it is set up for BCD count.
At 0000. OUT 5 goes active. triggering a conversion of the input
at channel O. The counter then automatically reloads itself with
a 0099 and starts the process over.
66
BASIC:
HEX
10
OUT(3D)=23 17
20 DUT(2B)=255 FF
30 OUT(2B)=13B BA
40 OUT(30)=05 05
50 OUT(2B)=49 31
60 OUT(2B)=31 IF
70 OUT(2B)=153 99
BO OUT(2B)=DO 00
90 DUT(30)=112 70
100 OUT(lB)=OD 00
110 OUT(16)=12
OC
300 IF IN(16)/12B=0 GOTO 300
310 A=IN(lB)
320
B:IN(2D)
330 PRINTU.B.A
340
GOTD 300
Set Data Pointer to Master Mode
Register
Set Master Mode Register to: BCD
Scaler. Data Pointer Increment
Set Data Pointer to Counter Mode
Register 5
Set
Counter Mode Register 5 to:
Source:F5.
Reload from Load. BCD
Count. Active HI Te. Count Down
Set Load Register 5 to 0099
load and Arm Counter 5
Set Channel to 0
Enable External Trigger Input
Wait for "DONE" bit
INPUT and PRINT Lo and Hi byte of
Value just Converted
Go Back and Wait for Another