Rainbow Electronics T89C51CC02 - Manual (Page 25)

Rev.A - May 17, 2001 25
Preliminary
T89C51CC02
Hardware Security
The following procedure is used to program the Hardware Security space and is summarized in Figure 10:
•
Set FPS and map Harware byte (FCON = 0x0C)
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Disable the interrupts.
•
Load DPTR at address 0000h.
•
Load Accumulator register with the data to load.
•
Execute the MOVX @DPTR, A instruction.
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Launch the programming by writing the data sequence 54h followed by A4h in FCON register.
The end of the programming indicated by the FBusy flag cleared.
•
Enable the interrupts.
Figure 10. Hardware Programming Procedure
FLASH Spaces
Programming
Disable IT
EA= 0
Launch Programming
FCON= 54h
FCON= A4h
End Programming
Enable IT
EA= 1
FBusy
Cleared?
Erase Mode
FCON = 00h
Data Load
DPTR= 00h
ACC= Data
Exec: MOVX @DPTR, A
FCON = 0Ch