Section 12 Watchdog Timer (WDT)
Rev. 1.00 Mar. 12, 2008 Page 422 of 1178
REJ09B0403-0100
12.4.2 Interval
Timer
Mode
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows, as shown in figure 12.3. Therefore, an interrupt can be generated at
intervals. When the TCNT overflows in interval timer mode, an interval timer interrupt (WOVI) is
requested at the same time the OVF bit of TCSR is set to 1. The timing is shown in figure 12.4.
TCNT value
H'00
Time
H'FF
WT/
IT
= 0
TME = 1
WOVI
Overflow
Overflow
Overflow
Overflow
WOVI : Interval timer interrupt request occurrence
WOVI
WOVI
WOVI
Figure 12.3 Interval Timer Mode Operation
φ
TCNT
H'FF
H'00
Overflow signal
(internal signal)
OVF
Figure 12.4 OVF Flag Set Timing
Содержание H8S Family
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