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HD64F2145 Datasheet(PDF) 374 Page - Renesas Technology Corp

Part # HD64F2145
Description  Hitachi 16-Bit Single-Chip Microcomputer
PDF  829 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD64F2145 Datasheet(HTML) 374 Page - Renesas Technology Corp

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Rev. 2.0, 08/02, page 334 of 788
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 bit of TCSR is set to 1. The timing is shown figure 14.4.
TCNT value
H'00
Time
H'FF
WT/
= 0
TME = 1
WOVI
Overflow
Overflow
Overflow
Overflow
WOVI : Internal timer interrupt request occurrence
WOVI
WOVI
WOVI
Figure 14.3 Interval Timer Mode Operation
ø
TCNT
H'FF
H'00
Overflow signal
(internal signal)
OVF
Figure 14.4 OVF Flag Set Timing



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