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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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UPD17708 Datasheet(PDF) 322 Page - NEC |
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UPD17708 Datasheet(HTML) 322 Page - NEC |
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322 / 356 page  322 µPD17704, 17705, 17707, 17708, 17709 21.6.2 Watchdog timer setting flags These flags can be set only once after power-ON reset on power application or reset by the RESET pin. The WDTCK0 and WDTCK1 flags select an interval at which the reset signal is output. The reference time can be selected to the following three conditions: • 655356 instructions • 131072 instructions • Watchdog timer not set On power application, 131072 instructions are selected. If the reset signal generation interval is specified to be 131072 instructions, the watchdog timer FF must be reset at intervals not exceeding 131072 instructions. The valid reset period is from 1 to 131071 instructions. If the reset signal generation interval is 65536 instructions, the watchdog timer FF must be reset at intervals not exceeding 65536 instrutions. The valid reset period is from 1 to 65535 instructions. Figure 21-12. Configuration of Watchdog Timer Clock Selection Register Name Flag symbol b3 0 b2 0 b1 W D T C K 1 b0 W D T C K 0 Address 02H Read/Write R/WNote Watchdog timer clock selection Power-ON reset WDT&SP reset CE reset Clock stop 0 011 0 1 0 1 Does not set watchdog timer 65536 instructions Setting prohibited 131072 instructions Selects clock of watchdog timer Fixed to “0” 0 0 1 1 Retained Retained Retained Note Can be written only once. |
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