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Put the hex number 0000 (decimal 0) in counter 2 load register:
OUT CR, &HA
OUT DR, &H0
OUT DR, &H0
‘POINT TO COUNTER 2 LOAD REGISTER (TABLE 5-1)
‘COUNTER 2 LSB
‘COUNTER 2 MSB
Next, set up the counter 4 mode register (see Figure 5-2). These are the settings we will use:
Gating Control = no gating
Source Edge = rising edge
Count Source Selection = F1
Count Control = disable special gate
= reload from load
= count repetitively
= binary count
= count down
Output Control = TC toggled
VALUE = HEX 0B22
OUT CR, &H4
OUT DR, &H22
OUT DR, &H0B
‘POINT TO COUNTER 4 MODE REGISTER (TABLE 5-1)
‘COUNTER 4 MODE LSB
‘COUNTER 4 MODE MSB
Put the hex number 2710 (decimal 10,000) in counter 4 load register:
OUT CR, &HC
OUT DR, &H10
OUT DR, &H27
‘POINT TO COUNTER 4 LOAD REGISTER (TABLE 5-1)
‘COUNTER 4 LSB
‘COUNTER 4 MSB
Next, set up the counter 5 mode register (see Figure 5-2). These are the settings we will use:
Gating Control = no gating
Source Edge = rising edge
Count Source Selection = TCN-1
Count Control = disable special gate
= reload from load
= count repetitively
= binary count
= count down
Output Control = TC toggled
VALUE = HEX 0022
OUT CR, &H5
OUT DR, &H22
OUT DR, &H0
‘POINT TO COUNTER 5 MODE REGISTER (TABLE 5-1)
‘COUNTER 5 MODE LSB
‘COUNTER 5 MODE MSB
Put the hex number 1F4 (decimal 500) in counter 5 load register:
OUT CR, &HD
OUT DR, &HF4
OUT DR, &H1
‘POINT TO COUNTER 5 LOAD REGISTER (TABLE 5-1)
‘COUNTER 5 LSB
‘COUNTER 5 MSB
OUT IRQCLR, 0
OUT CR, &H7B
‘CLEAR INTERRUPT STATUS
‘LOAD & ARM COUNTERS 1,2,4 & 5 (TABLE 5-2)
5-11