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12.3.3
Interval Timer Mode
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows. Therefore, an interrupt can be generated at intervals.
TCNT count
H'00
Time
H'FF
WT/
= 0
TME = 1
WOVI
Overflow
Overflow
Overflow
Overflow
WOVI: Interval interrupt request generation
WOVI
WOVI
WOVI
Figure 12.4 Operation in Interval Timer Mode
12.3.4
Timing of Setting of Overflow Flag (OVF)
The OVF flag is set to 1 if TCNT overflows during interval timer operation. At the same time, an
interval timer interrupt (WOVI) is requested. This timing is shown in figure 12.5.
ø
ø1
ø1
ø1
TCNT
H'FF
H'00
Overflow signal
(internal signal)
OVF
Figure 12.5 Timing of OVF Setting
Summary of Contents for H8S/2215 Series
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