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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UPD78P014 데이터시트(PDF) 22 Page - NEC |
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UPD78P014 데이터시트(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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