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UPD78P014 датащи(PDF) 22 Page - NEC |
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UPD78P014 датащи(HTML) 22 Page - NEC |
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22 / 62 page ![]() 22 µPD78P014 4.3 PROM Read Procedure PROM contents can be read onto the external data bus (D0 to D7) using the following procedure. (1) Fix the RESET pin low. Supply +5 V to the VPP pin. Unused pins are handled as shown in “PIN CONFIGURATION (2) PROM programming mode”. (2) Supply +5 V to the VDD and VPP pins. (3) Input address of data to be read to pins A0 through A14. (4) Read mode . (5) Output data to pins D0 through D7. Timing for steps (2) through (5) above is shown in Figure 4-3. Figure 4-3. PROM Read Timing A0-A14 Address Input CE (Input) OE (Input) D0-D7 Data Output Hi-Z Hi-Z |
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