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H8S/2218 Scheda tecnica(PDF) 393 Page - Renesas Technology Corp

Il numero della parte H8S/2218
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  750 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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Section 10 Watchdog Timer (WDT)
Rev.6.00 Jun. 03, 2008 Page 345 of 698
REJ09B0074-0600
10.3.4
Timing of Setting of 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 10.5.
φ
TCNT
H'FF
H'00
Overflow signal
(internal signal)
OVF
Figure 10.5 Timing of OVF Setting
10.4
Interrupts
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. OVF must be
cleared to 0 in the interrupt handling routine.
Table 10.1
WDT Interrupt Source
Name
Interrupt Source
Interrupt Flag
WOVI
TCNT overflow
WOVF



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