T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 25

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

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