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H8S2245 데이터시트(PDF) 429 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 11 Watchdog Timer
Rev.3.00 Mar. 26, 2007 Page 387 of 772
REJ09B0355-0300
Section 11 Watchdog Timer
11.1
Overview
The H8S/2245 Group has a single-channel on-chip watchdog timer (WDT) for monitoring system
operation. The WDT outputs an overflow signal (
WDTOVF) if a system crash prevents the CPU
from writing to the timer counter, allowing it to overflow. At the same time, the WDT can also
generate an internal reset signal for the H8S/2245 Group.
When this watchdog function is not needed, the WDT can be used as an interval timer. In interval
timer operation, an interval timer interrupt is generated each time the counter overflows.
11.1.1
Features
WDT features are listed below.
• Switchable between watchdog timer mode and interval timer mode
• WDTOVF output when in watchdog timer mode
If the counter overflows, the WDT outputs
WDTOVF. It is possible to select whether or not
the entire H8S/2245 Group is reset at the same time. This internal reset can be a power-on reset
or a manual reset.
• Interrupt generation when in interval timer mode
If the counter overflows, the WDT generates an interval timer interrupt.
• Choice of eight counter clock sources.



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