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7733 データシート(PDF) 449 Page - Renesas Technology Corp

部品番号 7733
部品情報  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 データシート(HTML) 449 Page - Renesas Technology Corp

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APPLICA
TIONS
7733 Group User’s Manual
17–42
(3) Approximate flowchart
17.3 Watchdog timer
Fig. 17.3.2 Approximate flowchart
Watchdog timer register
8-bit dummy data
(address 6016)
Main routine
Watchdog timer is initialized.
Watchdog timer’s value: FFF 16
(Note 1)
Watchdog timer interrupt routine
Software reset bit
“1 ”
(bit 3 at address 5E 16)
RTI
Watchdog timer interrupt
request occurs.
(Detection of a
program runaway)
(Note 2)
Microcomputer is resset.
Notes 1: The watchdog timer is initialized again from when the watchdog timer is initialized until the most
significant bit of the watchdog timer becomes “0,” in other words, until a watchdog timer interrupt
request occurs.
2: When a program runaway occurs, there is a possibility that values of data bank register (DT),
direct page register (DPR), and others are incorrect. When accessing the software reset bit by using
an addressing mode which uses DT, DPR, and others, be sure to set values of DT, DPR, and others again.



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