Prom Reading Procedure; Prom Read Timing - NEC PD78076 User Manual

27.3.3 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
programming mode and 2.5 Pin Configuration (Top View).
(2) Supply +5 V to the V
(3) Input address of data to be read to pins A0 through A16.
(4) Read mode.
(5) Output data to pins D0 through D7.
The timing for steps (2) through (5) above is shown in Figure 27-7.
A0 to A16
CE (Input)
OE (Input)
D0 to D7
578
CHAPTER 27 PD78P078, 78P078Y
PP
and V pins.
DD PP
Figure 27-7. PROM Read Timing
Address Input
Hi-Z
pin. Unused pins are handled as shown in, 1.5 (2) PROM
Data output
Hi-Z