Prom Reading Procedure; Prom Read Timing - NEC PD78052 User Manual

26.4.3 PROM reading procedure

PROM contents can be read onto the external data bus (D0 to D7) using the following procedure.
(1) Fix the RESET pin low, and supply +5 V to the V
(2) "PROM programming mode" in section 1.5 or 2.5 Pin Configuration (Top View).
(2) Supply +5 V to the V
(3) Input the address of data to be read to pins A0 through A16.
(4) Read mode is entered.
(5) Data is output to pins D0 through D7.
The timing for steps (2) through (5) above is shown in Figure 26-8.
A0-A16
CE (Input)
OE (Input)
D0-D7
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CHAPTER 26
and V pins.
DD PP
Figure 26-8. PROM Read Timing
Address Input
Hi-Z
PD78P054, 78P058
pin. Unused pins are handled as shown in paragraph,
PP
Data Output
Hi-Z