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38K2 Datasheet(PDF) 229 Page - Renesas Technology Corp |
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38K2 Datasheet(HTML) 229 Page - Renesas Technology Corp |
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229 / 358 page  2.9 Watchdog timer Rev.2.00 Oct 15, 2006 page 80 of 112 38K2 Group REJ09B0338-0200 APPLICATION 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: •An underflow of watchdog timer H is judged to be program runaway, and the microcomputer is returned to the reset status. •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. •Through mode is used as a system clock division ratio. •An underflow signal of the watchdog timer L is supplied as the count source of watchdog timer H. Figure 2.9.4 shows a watchdog timer connection and division ratio setting; Figure 2.9.5 shows the related registers setting; Figure 2.9.6 shows the control procedure. Fig. 2.9.4 Watchdog timer connection and division ratio setting f(XIN) = 6 MHz 1/16 1/256 1/256 RESET Fixed Watchdog timer L Watchdog timer H STP instruction disable bit STP instruction Reset circuit Internal reset |
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