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7906 Datasheet(PDF) 341 Page - Renesas Technology Corp |
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7906 Datasheet(HTML) 341 Page - Renesas Technology Corp |
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341 / 531 page  WATCHDOG TIMER 7906 Group User’s Manual Rev.2.0 14-8 [Precautions for watchdog timer] [Precautions for watchdog timer] 1. When dummy data has been written to address 6016 with the 16-bit data length, writing to address 6116 is simultaneously performed. Accordingly, when the user does not want to change the contents of the watchdog timer frequency select bit (bit 0 at address 6116) and watchdog timer clock source select bits at STP termination (bits 6, 7 at address 6116), be sure to write again the values which are currently set in these bits, simultaneously with writing to address 6016. 2. When the STP instruction is executed, the watchdog timer stops its operation. If the STP instruction’s code (3116, 3016) has accidentally been executed owing to a program runaway, the watchdog timer stops its operation. Therefore, in the system where the watchdog timer is used to detect a program runaway, we recommend that the STP instruction invalidity select bit (bit 0 at address 6216) = “1.” (STP instruction is invalid.) Refer to section “15.3 Stop mode.” |
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