參數(shù)資料
型號: 68HC705J5A
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 97/106頁
文件大?。?/td> 1069K
代理商: 68HC705J5A
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
REV 2.1
MOTOROLA
B-5
B.5.2 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
operations.
DD
during normal
Figure B-2
shows the flow required to successfully program the EPROM.
Figure B-2. EPROM Programming Sequence
START
ELAT=1
Write EPROM byte
PGM=1
Wait 1ms
PGM=0
ELAT=0
Write
additional
byte
N
Y
END
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