AT89C51CC03U-S3SIM ATMEL [ATMEL Corporation], AT89C51CC03U-S3SIM Datasheet - Page 52

• Manufacturer Part Number: AT89C51CC03U-S3SIM
• Description: Enhanced 8-bit MCU with CAN Controller and Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

Hardware Security Byte
52
AT89C51CC03
Figure 26. Flash and Extra Row Programming Procedure
The following procedure is used to program the Hardware
and is summarized in Figure 27:
•
•
•
•
•
•
•
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 (only from FM1).
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 25
FCON = Axh
FCON = 00h
FCON = 5xh
Clear Mode
Cleared?
Restore IT
FBusy
EA = 0
Security
4182I–CAN–06/05
Byte space