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UPD78P324LP 数据表(PDF) 21 Page - NEC |
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UPD78P324LP 数据表(HTML) 21 Page - NEC |
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21 / 80 page  µPD78P324, 78P324(A) 21 3.3 PROCEDURE FOR PROM READ The PROM content is read to the external data bus (D0-D7) in accordance with the following procedure: (1) Fix to RESET = H; and AVDD = L. Other unused pins are processed as directed by the PIN CONFIGURATION. (2) Supply +5 V to the VDD and VPP pins. (3) Enter the address of the data read into the A0-A16 pin. (4) Read mode (CE = L; OE = L) (5) Data is output to the D0-D7 pin. The timing of the above (2) to (5) is shown in Figure 3-4. Figure 3-4. PROM Read Timing Address input Data output A0-A14 CE (input) OE (input) D0-D7 Hi-Z Hi-Z |
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