Rainbow Electronics T89C5115 - Manual (Page 34)

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T89C5115
4128A–8051–04/02
Figure 13. Flash and Extra row Programming Procedure
Hardware Security Byte The following procedure is used to program the Hardware Security Byte space
and is summarized in Figure 14:
• 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
Flash Spaces
Programming
Save & Disable IT
EA= 0
Launch Programming
FCON= 5xh
FCON= Axh
End Programming
Restore IT
Column Latches Loading
see Figure 12
FBusy
Cleared?
Clear Mode
FCON = 00h