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H8SX/1663R Datasheet(PDF) 894 Page - Renesas Technology Corp

Part # H8SX/1663R
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1504 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX/1663R Datasheet(HTML) 894 Page - Renesas Technology Corp

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Section 18 Watchdog Timer (WDT)
Rev. 2.00 Sep. 24, 2008 Page 862 of 1468
REJ09B0412-0200
18.4.2
Interval Timer Mode
To use the WDT as an interval timer, set the WT/
IT bit to 0 and the TME bit to 1 in TCSR.
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows. 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 in the TCSR is set to 1.
TCNT value
H'00
Time
H'FF
WT/
IT = 0
TME = 1
WOVI
Overflow
Overflow
Overflow
Overflow
[Legend]
WOVI: Interval timer interrupt request
WOVI
WOVI
WOVI
Figure 18.3 Operation in Interval Timer Mode
18.5
Interrupt Source
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. The OVF flag
must be cleared to 0 in the interrupt handling routine.
Table 18.2
WDT Interrupt Source
Name
Interrupt Source
Interrupt Flag
DTC Activation
WOVI
TCNT overflow
OVF
Impossible



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