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HD64F2149YV 数据表(PDF) 448 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 448 Page - Renesas Technology Corp |
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448 / 1075 page  Section 14 Watchdog Timer (WDT) Rev. 3.00 Jan 18, 2006 page 420 of 1044 REJ09B0280-0300 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 14.4 Operation in Interval Timer Mode 14.3.3 Timing of Setting of 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 14.5. If NMI request generation is selected in watchdog timer mode, when TCNT overflows the OVF bit in TCSR is set to 1 and at the same time an NMI interrupt is requested. φ TCNT H'FF H'00 Overflow signal (internal signal) OVF Figure 14.5 Timing of OVF Setting |
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