T89C5115 ATMEL Corporation, T89C5115 Datasheet - Page 34

• Manufacturer Part Number: T89C5115
• Description: Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory
• Manufacturer: ATMEL Corporation

Hardware Security Byte
34
T89C5115
Figure 13. Flash and Extra row Programming Procedure
The following procedure is used to program the Hardware
and is summarized in Figure 14:
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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 (only from FM1).
The end of the programming indicated by the FBusy flag cleared.
Restore the interrupts
Column Latches Loading
Launch Programming
End Programming
Save & Disable IT
Programming
Flash Spaces
see Figure 12
FCON = 00h
FCON= Axh
Clear Mode
FCON= 5xh
Cleared?
Restore IT
FBusy
EA= 0
Security
4128A–8051–04/02
Byte space