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UPD753012 Datasheet(PDF) 39 Page - NEC |
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UPD753012 Datasheet(HTML) 39 Page - NEC |
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39 / 80 page  39 µPD753012, 753016, 753017 9. RESET FUNCTION There are two reset inputs: external reset signal (RESET) and reset signal sent from the basic interval timer/ watchdog timer. When either one of the reset signals are input, an internal reset signal is generated. Figure 9- 1 shows the circuit diagram of the above two inputs. Figure 9-1. Configuration of Reset Function RESET Internal reset signal Reset signal sent from the basic interval timer/watchdog timer WDTM Internal bus The µPD753017 is set by the RESET signal generated and each device is initialized as listed in Table 9-1. Figure 9-2 shows the timing chart of the reset operation. Figure 9-2. Reset Operation by RESET Signal Generation Operation mode or standby mode Wait Note RESET signal generated Operation mode HALT mode Internal reset operation Note The following two times can be selected by the mask option. 217/fX (21.8 ms : at 6.00 MHz operation, 31.3 ms : at 4.19 MHz operation) 215/fX (5.46 ms : at 6.00 MHz operation, 7.81 ms : at 4.19 MHz operation) |
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