mc68hc05pl4b Freescale Semiconductor, Inc, mc68hc05pl4b Datasheet - Page 93

• Manufacturer Part Number: mc68hc05pl4b
• Description: Low-cost Single-chip Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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