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AT89C5131A-RDTUL Datasheet(PDF) 33 Page - ATMEL Corporation

No. de pieza AT89C5131A-RDTUL
Descripción Electrónicos  8-bit Flash Microcontroller with Full Speed USB Device
PDF  186 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131A-RDTUL Datasheet(HTML) 33 Page - ATMEL Corporation

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AT89C5131A-L
4338F–USB–08/07
Hardware Security
The following procedure is used to program the Hardware Security space and is sum-
marized in Figure 19:
•
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 register.
The end of the programming indicated by the FBusy flag cleared.
•
Enable the interrupts.
Figure 19. 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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