8. Special I/O Functions
8.3.3Quadrature bi-pulse counter
Function
This function counts up or down the quadrature
Consequently, 4 times count value against the pulse frequency is obtained.
Phase A
Phase B
Up count | Down count |
When the count value reaches the comparison value 1 (or 2), the I/O interrupt program #1 (or #2) is activated (if the interrupt enable flag for each is ON).
This counter operation is enabled while the
When the
The comparison value 1 and 2 can be changed even when the
Hardware condition
Phase A and phase B (X000 and X001)
ON/OFF pulse width: 100 ms or more (max. 5 kHz)
Reset input (X002)
ON/OFF duration: 2 ms or more
Related registers
SW16: Function selection. Refer to section 8.1.
Function | Register/device | Remarks |
Phase A | X000 |
|
Phase B | X001 |
|
Reset input | X002 |
|
Comparison value 1 | SW19×SW18 | Data range: |
Comparison value 2 | SW21×SW20 |
|
Count value | SW23×SW22 |
|
S240 | Operation is enabled when ON | |
Interrupt enable 1 | S241 | Interrupt 1 is enabled when ON |
Count preset 1 | S243 | Used to preset the count value |
Interrupt enable 2 | S249 | Interrupt 2 is enabled when ON |
Count preset 2 | S24B | Used to preset the count value |
Basic Hardware and Function 277
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