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H8/3021 Datasheet(PDF) 350 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 350 Page - Renesas Technology Corp |
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350 / 712 page  10. Watchdog Timer Rev.2.00 Mar. 22, 2007 Page 326 of 684 REJ09B0352-0200 H'FF H'00 RESO WDT overflow Start H'00 written in TCNT Reset TME set to 1 H'00 written in TCNT Internal reset signal 518 states 132 states TCNT count value OVF = 1 Figure 10.4 Watchdog Timer Operation (Mask ROM Version) 10.3.2 Interval Timer Operation Figure 10.5 illustrates interval timer operation. To use the WDT as an interval timer, clear bit WT/ IT to 0 and set bit TME to 1 in TCSR. An interval timer interrupt request is generated at each TCNT overflow. This function can be used to generate interval timer interrupts at regular intervals. TCNT count value Time t Interval timer interrupt Interval timer interrupt Interval timer interrupt Interval timer interrupt Interval timer interrupt WT/ = 0 TME = 1 IT H'FF H'00 Figure 10.5 Interval Timer Operation |
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