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H8S/2224 Scheda tecnica(PDF) 561 Page - Renesas Technology Corp

Il numero della parte H8S/2224
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  1071 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 561 Page - Renesas Technology Corp

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Section 13 Watchdog Timer (WDT)
Rev. 5.00 Aug 08, 2006 page 475 of 982
REJ09B0054-0500
TCNT value
H'00
Time
H'FF
WT/
IT=0
TME=1
WOVI
Overflow
Overflow
Overflow
Overflow
Legend:
WOVI: Interval timer interrupt request generation
WOVI
WOVI
WOVI
Figure 13.3 Interval Timer Mode Operation
13.4.3
Timing of Setting Overflow Flag (OVF)
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 13.4.
When NMI request is chosen in watchdog timer mode for WDT_1, TCNT overflow sets the OVF
flog to 1. At the same time, NMI interrupt is requested.
φ
TCNT
H'FF
H'00
OVF
Overflow signal
(internal signal)
Figure 13.4 Timing of OVF Setting



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