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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8SX/1663 数据表(PDF) 700 Page - Renesas Technology Corp |
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H8SX/1663 数据表(HTML) 700 Page - Renesas Technology Corp |
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700 / 1158 page  Section 14 Watchdog Timer (WDT) Rev.1.00 Jun. 07, 2006 Page 648 of 1102 REJ09B0294-0100 14.4.2 Interval Timer Mode To use the WDT as an interval timer, set the WT/ IT bit to 0 and the TME bit to 1 in TCSR. When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each time the TCNT overflows. Therefore, an interrupt can be generated at intervals. When the TCNT overflows in interval timer mode, an interval timer interrupt (WOVI) is requested at the same time the OVF bit in the TCSR is set to 1. TCNT value H'00 Time H'FF WT/ IT = 0 TME = 1 WOVI Overflow Overflow Overflow Overflow [Legend] WOVI: Interval timer interrupt request WOVI WOVI WOVI Figure 14.3 Operation in Interval Timer Mode 14.5 Interrupt Source During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI). The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. The OVF flag must be cleared to 0 in the interrupt handling routine. Table 14.2 WDT Interrupt Source Name Interrupt Source Interrupt Flag DTC Activation WOVI TCNT overflow OVF Impossible |
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