Rev. 5.00, 12/03, page 418 of 1088
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
Note:
*
The
WDTOVF
output function is not available in the F-ZTAT versions.
H'FF
H'00
Overflow signal
(internal signal)
WOVF
WDTOVF
signal
*
Internal reset
signal
132 states
518 states
Figure 11-7 Timing of WOVF Setting
11.4
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.
11.5
Usage Notes
11.5.1
Contention between Timer Counter (TCNT) Write and Increment
If a timer counter clock pulse is generated during the T
2
state of a TCNT write cycle, the write
takes priority and the timer counter is not incremented. Figure 11-8 shows this operation.
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