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7906 Datasheet(PDF) 437 Page - Renesas Technology Corp |
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7906 Datasheet(HTML) 437 Page - Renesas Technology Corp |
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437 / 531 page  7906 Group User’s Manual Rev.2.0 APPENDIX 20-32 Appendix 2. Control registers Undefined 7 to 0 Bit Function At reset R/W Disables the watchdog timer. When values of “7916” and “5016” succeedingly in this order, the watchdog timer will stop its operation. — b0 b7 Particular function select register 2 (Address 6416) Note: After reset, this register can be set only once. Writing to this register requires the following procedure: • Write values of “7916” and “5016” to this register succeedingly in this order. • For the above writing, be sure to use the MOVMB (MOVM when m = 1) instruction or the STAB (STA when m = 1). Note that the following: if an interrupt occurs between writing of “7916” and next writing of “5016,” the watchdog timer does not stop its operation. If any of the following has been performed after reset, writing to this register will be disabled from that time: • If this register is read out. • If writing to this register is performed by the procedure other than the above procedure. Reference 14-4 |
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