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HD6432351 Datasheet(PDF) 575 Page - Renesas Technology Corp |
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HD6432351 Datasheet(HTML) 575 Page - Renesas Technology Corp |
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575 / 1025 page  Section 12 Watchdog Timer (WDT) Rev. 3.00 Sep 15, 2006 page 541 of 988 REJ09B0330-0300 12.3.2 Interval Timer Operation To use the WDT as an interval timer, clear the WT/ IT bit in TCSR to 0 and set the TME bit to 1. An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the WDT is operating as an interval timer, as shown in figure 12.5. This function can be used to generate interrupt requests at regular intervals. TCNT count H'00 Time H'FF WT/ IT = 0 TME = 1 WOVI Overflow Overflow Overflow Overflow Legend: WOVI: Interval timer interrupt request generation WOVI WOVI WOVI Figure 12.5 Interval Timer Operation 12.3.3 Timing of Setting Overflow Flag (OVF) The OVF flag is set to 1 if TCNT overflows during interval timer operation. At the same time, an interval timer interrupt (WOVI) is requested. This timing is shown in figure 12.6. |
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