HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 421

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

11.3.2
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.
11.3.3
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 11.6.
406
Legend
WOVI: Interval timer interrupt request generation
H'FF
H'00
TCNT count
WT/IT=0
TME=1
Interval Timer Operation
Timing of Setting Overflow Flag (OVF)
Overflow
WOVI
Figure 11.5 Interval Timer Operation
Overflow
WOVI
Overflow
WOVI
Overflow
WOVI
Time