HD6412350 Hitachi, HD6412350 Datasheet - Page 545
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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12.3.2
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 12-5. This function can be used to
generate interrupt requests at regular intervals.
12.3.3
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 12-6.
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 12-5 Interval Timer Operation
Overflow
WOVI
Overflow
WOVI
Overflow
WOVI
Time
525
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