參數(shù)資料
型號: MC68HC05J5AP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數(shù): 111/113頁
文件大?。?/td> 1212K
代理商: MC68HC05J5AP
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
MOTOROLA
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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