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MCS-51 available internal ROM

Miloš Rašic

Is all of the 4kb internal ROM on Intel MCS-51 available for user code? Are there any system routines that might take up some of the space? I managed to optimize my code to 4091b and I'd really like to know whether I need to optimize it further.

Thanks.

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  • 0 in reply to Miloš Rašic

    would fit in the original Intel 8051 microcontroller internal ROM.
    why> it's been out of production for a decade.

    anyhow, if the I/O is the same (many modern derivatives have 'advanced' I/O) the brand does not matter. Of course, if you transfer from a derivative with e.g. HW I²C to bit-banging there will be a difference.

    Erik

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  • 0 in reply to Miloš Rašic

    would fit in the original Intel 8051 microcontroller internal ROM.
    why> it's been out of production for a decade.

    anyhow, if the I/O is the same (many modern derivatives have 'advanced' I/O) the brand does not matter. Of course, if you transfer from a derivative with e.g. HW I²C to bit-banging there will be a difference.

    Erik

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