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ModSlaveSim help v3.07 - 4.4.4. Counters
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A counter is a register that is incremented each time an input changes from 0 to 1 (i.e. counters are edge triggered).
This counter keeps incrementing each time its Input changes from 0 to 1, until it is reset by setting the Reset input to 1.
Table 10. Simple counter
| Register Address | Register Name | Statement |
|---|---|---|
| $100 | Input | |
| $101 | Last input | $100 |
| $102 | Reset | |
| $103 | Count |
if $102 != 0 then 0 else if $100 != 0 && $101 == 0 then $$ + 1 |
This counter increments up to a preset Limit. When it reaches the limit, it stops counting and sets its Output to 1.
Table 11. Preset counter
| Register Address | Register Name | Statement |
|---|---|---|
| $100 | Input | |
| $101 | Last input | $100 |
| $102 | Limit | |
| $103 | Reset | |
| $104 | Output |
if $105 == $102 then 1 else 0
|
| $105 | Count |
if $103 != 0 then 0 else if $100 != 0 && $101 == 0 && $$ < $102 then $$ + 1 |
This counter (like the Preset counter) counts up to a preset Limit, but when it reaches the limit it automatically resets and starts counting again.
The Output is 1 for one cycle each time the counter resets.
Table 12. Repetitive counter
Register Address |
Register Name |
Statement |
|---|---|---|
| $100 | Input | |
| $101 | Last input | $100 |
| $102 | Limit | |
| $103 | Output |
if $104 == $102 then 1 else 0
|
| $104 | Count |
if $100 != 0 && $101 == 0 then if $$ < $102 then $$ + 1 else 0 |