HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 442

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 11 Watchdog Timer
11.3.4
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/2245 Group chip. Figure 11.7 shows the timing
in this case.
11.4
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. OVF must be
cleared to 0 in the interrupt handling routine.
Rev.3.00 Mar. 26, 2007 Page 400 of 772
REJ09B0355-0300
TCNT
Overflow signal
(internal signal)
WOVF
WDTOVF signal
Internal reset
signal
Timing of Setting of Watchdog Timer Overflow Flag (WOVF)
Interrupts
Figure 11.7 Timing of Setting of WOVF
H'FF
132 states
H'00
518 states