Section 14
Watchdog Timer (WDT)
Rev. 1.00 Apr. 28, 2008 Page 399 of 994
REJ09B0452-0100
14.4.2
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 14.3. 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 flag of TCSR is set to 1. The timing is shown figure 14.4.
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 14.3 Interval Timer Mode Operation
φ
TCNT
H'FF
H'00
Overflow signal
(internal signal)
OVF
Figure 14.4 OVF Flag Set Timing
Содержание H8S/2100 Series
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