T89C51AC2-SLSIM datasheet(40/121 Pages) ATMEL

부품명	T89C51AC2-SLSIM

상세설명	Enhanced 8-bit Microcontroller with 32 KB Flash Memory

PDF	121 Pages

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제조업체	ATMEL [ATMEL Corporation]

홈페이지	http://www.atmel.com

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40 / 121 page

A/T89C51AC2

4127G–8051–05/06

Figure 22. 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 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.

Flash Spaces

Programming

Save and Disable IT

EA = 0

Launch Programming

FCON = 5xh

FCON = Axh

End Programming

Restore IT

Column Latches Loading

see Figure 21

FBusy

Cleared?

Clear Mode

FCON = 00h

T89C51AC2-SLSIM 데이터시트(PDF) 40 Page - ATMEL Corporation