Rev.6.00 Oct.28.2004 page 462
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REJ09B0138-0600H
13.3.4
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
H8S/2390.
ø
TCNT
Note:
*
The
WDTOVF
pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392,
or H8S/2390.
H'FF
H'00
Overflow signal
(internal signal)
WOVF
WDTOVF signal
*
Internal reset
signal
132 states
518 states
Figure 13-7 Timing of Setting of WOVF
13.4
Interrupts
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.
Содержание ZTAT H8S/2357F
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