Toshiba OIS PLUS Series, Руководство пользователя

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4.3 Quadrature Bi-pulse Counter
In the Quadrature mode, input X2 is used along with X7. When the count value reaches the Preset, forced
output will be activated and preset reached bit will be set ON. This counter operation is enabled while the
soft- gate (HSC Enable bit) is ON. The count value is reset to 0 when the reset input turns ON. The preset
value can be changed by writing the data into the preset register while the soft-gate is ON/OFF. The count
value range is 0 to 4294967295 (32-bit data).
For example, to configure the HSC in quadrature bi-pulse mode, follow the steps defined for single phase
counter (3.2). Change in the value of configuration register to 3.
This function counts up or down in the quadrature bi-pulse mode.
a) 1-edge count:
The current value increments or decrements at the rising or falling edge of the phase B input after the phase
A input has turned on as shown below:
b) 2-edge Count:
The current value increments or decrements at the rising or falling edge of the phase B input after the phase
A input has turned on or off as shown below:
c) 4-edge Count:
The current value changes (raise or decrease) at the rising or falling edges of the phase A and B inputs.
Both rising and falling edges of each phase are counted. Consequently, 4 times count value against the pulse
frequency is obtained.
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