參數資料
型號: HC05PL4GRS
英文描述: 68HC05PL4A. 68HC05PL4B. 68HC705PL4B General Release Specification
中文描述: 68HC05PL4A。 68HC05PL4B。 68HC705PL4B一般版本規(guī)范
文件頁數: 93/98頁
文件大小: 1004K
代理商: HC05PL4GRS
April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
REV 2.0
MOTOROLA
A-3
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
PP
pin while programming, but it should be
equal to V
DD
during normal operations.
Figure A-2
shows the flow required to successfully program the EPROM.
A.5 EPROM PROGRAMMING SPECIFICATIONS
Table A-2. EPROM Programming Electrical Characteristics
(V
DD
= 4V
±
10%, V
SS
= 0 Vdc, T
A
= 0
°
C to +70
°
C, unless otherwise noted)
Characteristic
Symbol
Min
Typ
Max
Unit
Programming Voltage
V
PP
12.5
V
Programming Current
I
PP
5
10
mA
Programming Time per byte
t
EPGM
1
ms
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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