HD6432646 Hitachi, HD6432646 Datasheet - Page 462

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

12.3.4
In the WDT0, the WOVF flag is set to 1 if TCNT overflows during watchdog timer operation. If
TCNT overflows while the RSTE bit in RSTCSR is set to 1, an internal reset signal is generated
for the entire H8S/2646 Series chip. Figure 12-7 shows the timing in this case.
428
ø
TCNT
Overflow signal
(internal signal)
WOVF
Internal reset
signal
Overflow signal
(internal signal)
ø
OVF
TCNT
Timing of Setting of Watchdog Timer Overflow Flag (WOVF)
Figure 12-7 Timing of Setting of WOVF
Figure 12-6 Timing of Setting of OVF
H'FF
H'FF
515/516 states (WDT1)
H'00
518 states (WDT0)
H'00