UPD78P324 Datasheet, PDF (21/80 Pages) NEC – 16-/8-Bit Single-Chip Microcomputers

µPD78P324, 78P324(A)
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
A0-A14
Address input
CE (input)
OE (input)
Hi-Z
D0-D7
Hi-Z
Data output
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