Fujitsu MB90460 Series, Hardware Manual, Page: 294 / 739

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CHAPTER 13 16-BIT PPG TIMER
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Gate Trigger (PPG channel 0 only)
When gate trigger is used, PPG starts operation when rising edge of gate trigger is detected and stops when
falling is detected. In next rising edge, PPG restarts operation again.
Figure 13.6-5 Gate Trigger in PWM Mode when retriggering is enable
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PPG Interrupts
There are four types of interrupts sharing one interrupt flag (PCNTL:IRQF) selected by interrupt type bits
(PCNTL:IRS1,IRS0).
• Gate trigger (for PPG channel 0 only) or software trigger or retrigger
• Counter borrow
• Duty match occurs when PPG output rising in normal polarity or PPG output falling in inverted polarity
• Counter borrow or duty match
Figure 13.6-6 PPG Interrupt Timing
m
n
0
(1) = (n+1) * T ns
(2) = (m+1) * T ns
T: Count clock period
m: PCSR value
n: PDUT value
PPG
(1)
(2)
(normal polarity)
(inverted polarity)
Time
Counter value
Gate trigger
Rising edge detected
Falling edge detected
0002H 0001H 0000H 0002H
Counter value
Load
Count clock
Software trigger
PPG output
(normal polarity)
Interrupt
(by software trigger)
Interrupt
(by duty match)
Interrupt
(by counter borrow)