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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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HD6432138SW Scheda tecnica(PDF) 436 Page - Renesas Technology Corp |
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HD6432138SW Scheda tecnica(HTML) 436 Page - Renesas Technology Corp |
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436 / 1061 page  Section 14 Watchdog Timer (WDT) Rev. 4.00 Jun 06, 2006 page 382 of 1004 REJ09B0301-0400 TCNT value H'00 Time H'FF WT/ IT = 1 TME = 1 H'00 written to TCNT WT/ IT = 1 TME = 1 H'00 written to TCNT 518 system clock periods Internal reset signal Overflow OVF = 1* Legend: WT/ IT: Timer mode select bit TME: Timer enable bit OVF: Overflow flag Note: * Cleared to 0 by an internal reset when OVF is set to 1. XRST is cleared to 0. Figure 14.3 Operation in Watchdog Timer Mode 14.3.2 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 14.4. This function can be used to generate interrupt requests at regular intervals. |
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