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UPD178024 Datasheet(PDF) 31 Page - NEC |
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UPD178024 Datasheet(HTML) 31 Page - NEC |
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31 / 56 page  31 µPD178023, 178024 Data Sheet U14126EJ1V0DS00 5. STANDBY FUNCTION There are the following two standby functions to reduce the system power consumption. • HALT mode : The CPU operating clock is stopped. The average consumption current can be reduced by intermittent operation in combination with the normal operating mode. • STOP mode : The system clock oscillation is stopped. All operations by the system clock are stopped and current consumption can be considerably reduced. Figure 5-1. Standby Function 6. RESET FUNCTION There are the following three reset methods. • External reset input by RESET pin • Internal reset by watchdog timer runaway time detection • Internal reset by Power-On Clear (POC). System Clock Operation STOP Mode (System clock oscillation stopped) HALT Mode (Clock supply to CPU is stopped, oscillation continued) Interrupt Request Interrupt Request HALT Instruction STOP Instruction |
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