參數(shù)資料
型號(hào): MC68HC05J5ADW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁(yè)數(shù): 104/106頁(yè)
文件大?。?/td> 1419K
代理商: MC68HC05J5ADW
July 16, 1999
GENERAL RELEASE SPECIFICATION
REV 2.1
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 tPGMR
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 VPP pin while programming, but it should be equal to VDD during normal
operations.
Figure B-2 shows the ow 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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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