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Flash Programming for atmel Microcontroller

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vijayragavalu

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hi all
can any one tell me how to delete at89s51 memory through Serial programming mode(SPI mode:MOSI,MISO,SCK lines)
i read doc2487.pdf file.as per that, i sent Programming Enable command(0xAC,0x53,0x00) first and i get back (0x69).but my problem is i am not able to erase whole memory with the help of commands 0xAC,0x80,0x00,0x00.
i confused in RST logic . in my program i reset(logic High) at89s51 before entering to Programming enable and make it logic low(rst pin) after erase cycle.
still i have a problem can you tell me what is problem or give me related links to rectify it please
 

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