Rainbow-electronics T89C5115 Bedienungsanleitung PDF herunterladen (Seite 34)

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

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Rainbow-electronics T89C5115 Bedienungsanleitung Seite 34