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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M16C/26 датащи(PDF) 71 Page - Renesas Technology Corp |
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M16C/26 датащи(HTML) 71 Page - Renesas Technology Corp |
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71 / 239 page  Watchdog Timer 65 Renesas Technology Corp. M16C/26 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Under development Preliminary Specifications Rev. 0.9 Specifications in this manual are tentative and subject to change. Note 1: The WDC5 bit is set to 0 immediately after power-on (cold start). Watchdog timer start register Symbol Address When reset WDTS 000E16 Indeterminate W R b7 b0 Function The watchdog timer is initialized and starts counting after a write instruction to this register. The watchdog timer value is always initialized to 7FFF16 regardless of whatever value is written. Watchdog timer control register Symbol Address After reset WDC 000F16 00?XXXXX 2(Note1) Function Bit symbol RW b7 b6 b5 b4 b3 b2 b1 b0 High-order bit of watchdog timer WDC7 Bit name Prescaler select bit 0 : Divided by 16 1 : Divided by 128 Reserved bit Set to 0 0 RO RW RW RW Cold start / warm start discrimination flag (Note 2) 0 : Cold start 1 : Warm start WDC5 Note 2: The WDC5 bit will always be set to a 1 whenever the WDC SFR is written (regardless of value of WDC5 bit). Figure 1.10.2. Watchdog timer control and start registers BCLK Write to the watchdog timer start register (address 000E16) RESET PM12 = 0 Watchdog timer Set to 7FFF16 1/128 1/16 CM07 = 0 WDC7 = 1 CM07 = 0 WDC7 = 0 CM07 = 1 HOLD 1/2 Prescaler PM12 = 1 Watchdog timer interrupt request Reset Figure 1.10.1. Block diagram of watchdog timer |
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