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UPD784021 Datasheet(PDF) 9 Page - NEC |
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UPD784021 Datasheet(HTML) 9 Page - NEC |
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9 / 90 page ![]() 9 m m m m mPD784020, 784021 P00-P07 : Port 0 A8-A19 : Address bus P10-P17 : Port 1 RD : Read strobe P20-P27 : Port 2 WR : Write strobe P30-P37 : Port 3 WAIT : Wait P60-P63, P66, P67 : Port 6 HLDRQ : Hold request P70-P77 : Port 7 HLDAK : Hold acknowledge TO0-TO3 : Timer output ASTB : Address strobe CI : Clock input REFRQ : Refresh request RxD, RxD2 : Receive data RESET : Reset TxD, TxD2 : Transmit data X1, X2 : Crystal SCK0-SCK2 : Serial clock ANI0-ANI7 : Analog input ASCK, ASCK2 : Asynchronous serial clock ANO0, ANO1 : Analog output SI0-SI2 : Serial input AVREF1-AVREF3 : Reference voltage SO0-SO2 : Serial output AVDD : Analog power supply SB0 : Serial bus AVSS : Analog ground PWM0, PWM1 : Pulse width modulation output VDD : Power supply NMI : Non-maskable interrupt VSS : Ground INTP0-INTP5 : Interrupt from peripherals TEST : Test AD0-AD7 : Address/data bus |
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