Toshiba PROSEC T3 User Manual page 63

6. Function Details
(5) Operation
PI312 counts up by the single phase pulses into phase A.
In the normal count mode, PI312 counts at the rising edge of the pulse. On the other
hand, in the precision count mode, PI312 counts at both rising and falling edges of the
pulse. Therefore the count value becomes double in the precision count mode.
This mode function is enabled while both phase G and soft-gate are ON. (even when
the either is OFF, counting is not stopped)
The count value can be changed by directly writing a data into the buffer memory.
When the count value reaches the set-point-1, the count value is reset to 0 (zero).
The set-point-1 can be set in the range of 1 to 16777215.
When the interrupt-enable bit in the command register (YW) is ON, PI312's interrupt
function is enabled. In this condition, when the count value reaches the set-point-1,
the PI312 generates interrupt signal for the T3. Then corresponding I/O interrupt
program in the T3 will be started immediately. For details of the interrupt function, refer
to section 7.
When phase G or soft-gate comes OFF, the current count value is transferred into the
hold register.
Phase A
Phase G
Soft-gate
Set-point-1
Count value
0
Interrupt
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