H8S2214 Datasheet, PDF (507/936 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

Section 11 Watchdog Timer (WDT)
11.3.2 Interval Timer Operation
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 11.5. 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
Time
Legend:
WOVI: Interval timer interrupt request generation
Figure 11.5 Operation in Interval Timer Mode
Rev.4.00 Sep. 18, 2008 Page 447 of 872
REJ09B0189-0400