Freescale Semiconductor, Inc.
April 30, 1998
GENERAL RELEASE SPECIFICATION
PGM – EPROM ProGraM command
0 = Programming power is switched OFF from EPROM array.
1 = Programming power is switched ON to EPROM array. If ELAT ≠ 1,
then PGM = 0.
A.4.2 Programming Sequence
The EPROM programming sequence is:
1. Set the ELAT bit
2. Write the data to the address to be programmed
3. Set the PGM bit
4. Delay for a time t
PGMR
5. Clear the PGM bit
6. Clear the ELAT bit
The last two steps must be performed with separate CPU writes.
CAUTION
It is important to remember that an external programming voltage
must be applied to the V pin while programming, but it should be
PP
equal to V during normal operations.
DD
Figure A-2 shows the o w required to successfully program the EPROM.
A.5 EPROM PROGRAMMING SPECIFICATIONS
Table A-2. EPROM Programming Electrical Characteristics
(V = 4V ±10%, V = 0 Vdc, T = 0°C to +70°C, unless otherwise noted)
DD
SS
A
Characteristic
Symbol
Min
Typ
12.5
5
Max
—
Unit
V
Programming Voltage
Programming Current
Programming Time per byte
V
—
PP
I
—
10
mA
ms
PP
t
—
1
—
EPGM
MC68HC05PL4
REV 2.0
A-3
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