T89C51AC2-RLTIM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

T89C51AC2-RLTIM

Enhanced 8-bit Microcontroller with 32 KB Flash Memory

Atmel Corporation 

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Figure 22. Flash and Extra Row Programming Procedure

Flash Spaces

Programming

Column Latches Loading

see Figure 21

Save and Disable IT

EA = 0

Launch Programming

FCON = 5xh

FCON = Axh

FBusy

Cleared?

Clear Mode

FCON = 00h

End Programming

Restore IT

Hardware Security Byte

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

summarized in Figure 23:

• 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. This step of the procedure must be executed from FM1. The end of

the programming indicated by the FBUSY flag cleared.

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

• Restore the interrupts.

40 A/T89C51AC2

4127H–8051–02/08

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