FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 157)

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CHAPTER 8 PULSE WIDTH COUNT TIMER (PWC)
■ Pulse width measurement function
The pulse width measurement function can measure the "H" width, "L" width, and one-cycle width of
pulses input from an external pin (PWC pin).
• The PWC can perform continuous pulse width measurement.
• The measurement speed (internal count clock) can be selected from three different speeds.
• The width of long input pulses can be measured using an interrupt processing routine.
Table 8.1-2 "Available pulse width measured by pulse width measurement function" lists the available
pulse widths measured by the pulse width measurement function.
Table 8.1-2 Available pulse width measured by pulse width measurement function
Internal count clock cycle Interval time
1 t
inst 1 t
inst
to 2
8
t
inst
4 t
inst 2
2
t
inst
to 2
10
t
inst
32 t
inst 2
5
t
inst
to 2
13
t
inst
t
inst
: Instruction cycle (divide-by-four main clock oscillation)