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T89C51AC2-RLSI-M Datasheet(PDF) 27 Page - ATMEL Corporation

Part # T89C51AC2-RLSI-M
Description  8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
PDF  117 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51AC2-RLSI-M Datasheet(HTML) 27 Page - ATMEL Corporation

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Draft.A - March 30, 2001
27
Preview - Confidential
T89C51AC2
Hardware Security
The following procedure is used to program the Hardware Security space and is summarized in Figure 14:
• 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 14. 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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