T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 43

• Manufacturer Part Number: T89C51CC01
• Description: Enhanced 8-Bit Microcontroller
• Manufacturer: Atmel

Hardware Security Byte
4129K–CAN–01/05
Figure 22. Flash and Extra Row Programming Procedure
The following procedure is used to program the Hardware
and is summarized in Figure 23:
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Set FPS and map Hardware byte (FCON = 0x0C)
Save and 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. This step of the procedure must be executed from FM1. The end of
the programming indicated by the FBUSY flag cleared.
The end of the programming indicated by the FBusy flag cleared.
Restore the interrupts.
Column Latches Loading
Launch Programming
Save and Disable IT
End Programming
Programming
Flash Spaces
see Figure 21
FCON = Axh
FCON = 5xh
FCON = 00h
Clear Mode
Cleared?
Restore IT
FBusy
EA = 0
T89C51CC01
Security
Byte space
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