Table of Contents
Advertisement
22.2.3 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
Configurations (Top View), (2) PROM programming mode.
(2) Supply +5 V to the V
(3) Input address of data to be read to pins A0 to A16.
(4) Read mode.
(5) Output data to pins D0 to D7.
The timing for steps (2) to (5) above is shown in Figure 22 to 4.
A0 to A14
CE (Input)
www.DataSheet4U.com
OE (Input)
D0 to D7
500
CHAPTER 22 µ PD78P014, 78P014Y
and V
pins.
DD
PP
Figure 22-4. PROM Read Timing
Address Input
Hi-Z
pin. Unused pins are handled as shown in 1.5 or 2.5 Pin
PP
Data Output
Hi-Z
Advertisement
Table of Contents
