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Rev. 1.00, 05/04, page 229 of 544

11.4.2 Interval Timer Mode

When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each

time the TCNT overflows, as shown in figure 11.3. Therefore, an interrupt can be generated at

When the TCNT overflows in interval timer mode, an interval timer interrupt (WOVI) is requested

at the same time the OVF bit of TCSR is set to 1. The timing is shown figure 11.4.

Overflow Overflow Overflow Overflow

WOVI : Internal timer interrupt request occurrence

Figure 11.3 Interval Timer Mode Operation

Overflow signal

(internal signal)

Figure 11.4 OVF Flag Set Timing

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Renesas H8S/2111B Manuale Utente Pagina 263