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7733 Datasheet(PDF) 300 Page - Renesas Technology Corp |
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7733 Datasheet(HTML) 300 Page - Renesas Technology Corp |
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300 / 940 page  WATCHDOG TIMER 7733 Group User’s Manual 10-3 10.1.1 Watchdog timer The watchdog timer is a 12-bit counter that down-counts a count source which is selected by the watchdog timer frequency selection flag (bit 0 at address 6116). Value “FFF16” is automatically set in the watchdog timer in the following cases. Note that an arbitrary value cannot be set in the watchdog timer. q When dummy data is written to the watchdog timer register (Refer to Figure 10.1.2.) q When the most significant bit of the watchdog timer becomes “0” q When the STP instruction is executed (Refer to chapter “11. STOP AND WAIT MODES.”) q At reset Fig. 10.1.2 Structure of watchdog timer register 10.1 Block description b7 b0 Watchdog timer register (address 6016) Bit 7 to 0 Watchdog timer is initialized. By writing dummy data to this register, watchdog timer’s value is initialized to “FFF 16” (Dummy data: 0016 to FF16). At reset Un- defined WO RW Functions |
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