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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M38048FFHKP датащи(PDF) 265 Page - Renesas Technology Corp |
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M38048FFHKP датащи(HTML) 265 Page - Renesas Technology Corp |
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265 / 387 page  2-141 APPLICATION 2.9 Watchdog timer Rev.1.00 Jan 14, 2005 REJ09B0212-0100Z 3804 Group (Spec.H) 2.9.3 Watchdog timer application examples (1) Detection of program runaway Outline: If program runaway occurs, let the microcomputer reset, using the internal timer for detection of program runaway. Specifications: •High-speed mode is used as a main clock division ratio. •An underflow signal of the watchdog timer L is supplied as the count source of watchdog timer H. •1 cycle of main routine is 65.536 ms or less. •Before the watchdog timer H underflows, “0” is set into bit 7 of the watchdog timer control register at every cycle in a main routine. •An underflow of watchdog timer H is judged to be program runaway, and the microcomputer is returned to the reset status. Figure 2.9.4 shows a watchdog timer connection and division ratio setting; Figure 2.9.5 shows the relevant registers setting; Figure 2.9.6 shows the control procedure. Fig. 2.9.4 Watchdog timer connection and division ratio setting f(XIN) = 16 MHz 1/16 1/256 1/256 RESET Fixed Watchdog timer LWatchdog timer H STP instruction disable bit STP instruction Reset circuit Internal reset |
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