at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 45

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

Reset of columns latches space
7663B–8051–03/07
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Figure 7. Fuse Configuration Byte Programming Procedure
No automatic reset of the columns latches is performed after a successfull flash
write process. Resetting the columns latches during a flash write process is
mandatory. User shall implement a reset of the column latch before each col-
umn latch load sequence.
Launch the programming by writing the data sequence 55h followed by A5h in
FCON register.
The end of the programming indicated by the FBusy flag cleared.
Restore the interrupts
Exec: MOVX @DPTR, A
Launch Programming
End Programming
Save & Disable IT
Programming
FCON = 00h
FCON= A5h
FCON= 55h
Clear Mode
FCON = 0Dh
Cleared?
DPTR= 00h
ACC= Data
RestoreIT
Data Load
FBusy
FCB
EA= 0
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