D12320VF25IV Datasheet, PDF (623/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Watchdog Timer
13.3.2 Operation in Interval Timer Mode
To use the WDT as an interval timer, clear the WT/IT bit in TCSR to 0 and set the TME bit to 1.
An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the
WDT is operating as an interval timer, as shown in figure 13.5. This function can be used to
generate interrupt requests at regular intervals.
TCNT count
H'FF
Overflow
Overflow
Overflow
Overflow
H'00
WT/IT=0
TME=1
WOVI
WOVI
WOVI
WOVI
Legend:
WOVI: Interval timer interrupt request generation
Figure 13.5 Operation in Interval Timer Mode
Time
Rev.6.00 Sep. 27, 2007 Page 591 of 1268
REJ09B0220-0600