Fujitsu MB91260B Series Hardware Manual page 215

CHAPTER 10 PWC (Pulse Width Count: Pulse Width Measurement)
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Operation flowchart for pulse width count
Continuous measurement mode
Detect measurement start edge
Generation of overflow
→ OVIR flag set
Detect measurement end edge
→ EDIR flag set
Transfer the count value to PWCR
200
Various
setting
Restart
Clear counter
Start count
Up count
Stop count
Select count clock
Select operation / measurement mode
Clear interrupt flag
Enable interrupt
Select measurement input pin
Start by STRT bit
Single measurement mode
Detect measurement start edge
Generation of overflow
→ OVIR flag set
Detect measurement end edge
→ EDIR flag set
Clear counter
Start count
Up count
Stop count
Stop operation