Timing Of Setting Of Watchdog Timer Overflow Flag (Wovf); Interrupts - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Timing of Setting of Watchdog Timer Overflow Flag (WOVF)

The WOVF flag is set to 1 if TCNT overflows during watchdog timer operation. At the same time, the WDTOVF signal*

goes low. If TCNT overflows while the RSTE bit in RSTCSR is set to 1, an internal reset signal is generated for the entire

H8S/2357 Group chip. Figure 13-7 shows the timing in this case.

Note: * The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392, or

Overflow signal

(internal signal)

WDTOVF signal*

Internal reset

Note: * The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392,

or H8S/2390.

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.

Rev.6.00 Oct.28.2004 page 462 of 1016

REJ09B0138-0600H

Figure 13-7 Timing of Setting of WOVF