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Getting started with 8051

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glenjoy

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internal rom 8051

i think you can use the internal small program memory as a bootloader if you want to use an external FLASH ROM or want to create an emulator.
 

silvio

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80c42 programming

I'm getting mixed answers about the 8051, cause the datashet says it has 4K of Flash and can address a further 60K external memory, but you all say no, it has no internal Flash.

YES, it's true. 80C51 has no internal flash. The lower 4k that can reside on-chip can't be updated. Those bytes are ROM not Flash.

They are programmed by manufacturer as requested by the customer and according with a special order.
See in attachement a ROM CODE submission for Philips 80C51 where 4kb user ROM data, 64 byte ROM encryption key and ROM security bits are to be specified.

Thus you can use those microcontrollers found in the store only if the external program memory is provided (no matter if it's PROM, EPROM or FLASH)
 

suromenggolo

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what does it mean 8051

internal ROM of 80C51 can disable if EA=0, so must be external ROM.
 

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