CHAPTER 19
µ
PD78P0208
381
User’s Manual U11302EJ4V0UM
19.3.3 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 5 V to the V
PP
pin. Unused pins are handled as shown in
1.5 Pin
Configuration (Top View) (2) PROM programming mode
.
(2) 5 V to the V
DD
and V
PP
pins.
(3) Input the address of the 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) through (5) above is shown in Figure 19-7.
Figure 19-7. PROM Read Timing
A0 to A16
CE (input)
OE (input)
Address input
D0 to D7
Data output
Hi-Z
Hi-Z
Содержание mPD780208 Subseries
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