D12320VF25V Datasheet, PDF (461/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 11 Watchdog Timer
11.3.4 Timing of Watchdog Timer Overflow Flag (WOVF) Setting
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 chip. Figure 11.7 shows the timing in this case.
Note: * The WDTOVF output function is not available in the F-ZTAT versions.
φ
TCNT
H'FF
H'00
Overflow signal
(internal signal)
WOVF
WDTOVF signal*
132 states
Internal reset
signal
518 states
Note: * The WDTOVF output function is not available in the F-ZTAT versions.
Figure 11.7 Timing of WOVF Setting
Rev.7.00 Feb. 14, 2007 page 427 of 1108
REJ09B0089-0700