HD6432621 Hitachi, HD6432621 Datasheet - Page 457

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x 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. 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 12-7 shows the timing in
this case.
ø
TCNT
Overflow signal
(internal signal)
WOVF
WDTOVF signal
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
132 states
515/516 states (WDT1)
H'00
518 states (WDT0)
H'00
413