Prom Read Procedure; Prom Read Timing - NEC PD78056F User Manual

CHAPTER 26 PD78P058F, 78P058FY

26.3.3 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, and supply +5 V to the V pin. Unused pins are handled as shown in paragraph,
PP
(2) PROM programming mode in section 1.5 or 2.5 Pin Configuration (Top View).
(2) Supply +5 V to the V and V pins.
DD PP
(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 26-7.
Figure 26-7. PROM Read Timing
A0 to A16 Address Input
CE (Input)
OE (Input)
Hi-Z Hi-Z
D0-D7 Data Output
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