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UPD6708 Datasheet(PDF) 24 Page - NEC |
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UPD6708 Datasheet(HTML) 24 Page - NEC |
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24 / 72 page  24 µPD6708 4.2.1 Switching through pin control With bits 5 and 4 of CMR both ‘0’, the host interface mode can be switched by setting the C/D pin and R/W pin to the values shown in Table 4-4. Table 4-4. Switching Host Interface Mode by Pin Control C/D R/W Host Interface Mode 0 0 Data write mode 0 1 Data read mode 1 0 Command write mode 1 1 Status read mode Figure 4-1. Example of Host Controller Connections by Pin Control Caution If the power supply voltage moves out of the 5 V ±5 % range, the RESET pin must be driven low for 6 µs or more in order to reset the µPD6708. IEBus 120 Ω 120 Ω 5 V 12 MHz 5 V Power Supply Voltage Detection Circuit PD6708 µ VDD AVDD BUS+ BUS– XI XO GND TEST SCK SI SO IRQ C/D R/W CS RESET SCK SO SI INT Port Port Port Host Controller |
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