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| 68HC05J5A Datasheet, PDF (97/106 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units | |||
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Freescale Semiconductor, Inc.
July 16, 1999
GENERAL RELEASE SPECIFICATION
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 ï¬ow required to successfully program the EPROM.
START
ELAT=1
Write EPROM byte
PGM=1
Wait 1ms
PGM=0
ELAT=0
Y
Write
additional
byte?
N
END
Figure B-2. EPROM Programming Sequence
REV 2.1
B-5
For More Information On This Product,
Go to: www.freescale.com
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