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R5F72115D160FPV Datasheet(PDF) 686 Page - Renesas Technology Corp |
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R5F72115D160FPV Datasheet(HTML) 686 Page - Renesas Technology Corp |
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686 / 1228 page  Section 14 Watchdog Timer (WDT) Rev. 2.00 May. 08, 2008 Page 662 of 1200 REJ09B0344-0200 14.4.4 Using Interval Timer Mode When operating in interval timer mode, interval timer interrupts are generated at every overflow of the counter. This enables interrupts to be generated at set periods. 1. Clear the WT/ IT bit in WTCSR to 0, set the type of count clock in the CKS[2:0] bits in WTCSR, and set the initial value of the counter in WTCNT. 2. Set the TME bit in WTCSR to 1 to start the count in interval timer mode. 3. When the counter overflows, the WDT sets the IOVF bit in WTCSR to 1 and an interval timer interrupt request is sent to the INTC. The counter then resumes counting. H'FF ITI ITI ITI ITI H'00 WTCNT value ITI: Interval timer interrupt request generation WT/ IT = 0 TME = 1 Time Overflow Overflow Overflow Overflow [Legend] Figure 14.5 Operation in Interval Timer Mode |
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