Datasheet

4337K–USB–04/08

AT89C5130A/31A-M

Figure 8-6. Flash and Extra Row Programming Procedure

8.3.6.3 Hardware Security

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

Figure 8-7:

• Set FPS and map Hardware 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

The end of the programming indicated by the FBusy flag cleared.

• Enable the interrupts.

Flash Spaces

Programming

Disable IT

EA = 0

Launch Programming

FCON = 5xh

FCON = Axh

End Programming

Enable IT

EA = 1

Column Latches Loading

see Figure 8-5

FBusy

Cleared?

Erase Mode

FCON = 00h