Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 25)

Rev.A - May 17, 2001 25

Preliminary

T89C51CC02

Hardware Security

The following procedure is used to program the Hardware Security space and is summarized in Figure 10:

• 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

FLASH Spaces

Programming

Disable IT

EA= 0

Launch Programming

FCON= 54h

FCON= A4h

End Programming

Enable IT

EA= 1

FBusy

Cleared?

Erase Mode

FCON = 00h

Data Load

DPTR= 00h

ACC= Data

Exec: MOVX @DPTR, A

FCON = 0Ch

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 25