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22.2 PROM Programming
The µ PD78P014 and 78P014Y incorporate a 32K-byte PROM as program memory. When programming the
µ PD78P014 and 78P014Y, the PROM programming mode is set by means of the V
the connection of unused pins, see 1.5 or 2.5 Pin Configurations (Top View), (2) PROM programming mode.
22.2.1 Operating modes
When +5 V or +12.5 V is applied to the V
and 78P014Y are set to the PROM programming mode. This is one of the operating modes shown in Table 22-3
below according to the setting of the CE and OE pins.
The PROM contents can be read by setting the read mode.
Remark ×: L or H
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CHAPTER 22 µ PD78P014, 78P014Y
Table 22-3. PROM Programming Operating Modes
Pin RESET
Operating mode
Program write
L
Program verify
Program inhibit
Read
Output disabled
Standby
pin and a low-level signal is applied to the RESET pin, the µ PD78P014
PP
V
V
CE
PP
DD
+12.5 V +6 V
L
H
H
+5 V
+5 V
L
L
H
pin and the RESET pin. For
PP
OE
D0 to D7
H
Data input
L
Data output
H
High-impedance
L
Data output
H
High-impedance
×
High-impedance
497
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