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Issue regarding accessing XRAM in DS89C430

om patel

I have problem accessing XRAM in DS89C430. I have included startup.A51 file and followed the instruction under forum "http://www.keil.com/support/docs/3345.htm". The issue is when i debug the code all work fine, but when it comes to hardware, i wont get desired data i wrote into XRAM.
The code working well with P89V51RD2, but it is required to have faster processing. Please help.

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  • 0 in reply to ²erik malund

    "make a local, renamed copy of startup.a51"

    Renaming it is a preference - not mandatory.

    Having it local is also a preference (and one that I'd share) - not mandatory.

    "at the beginning set all SFRs that affect XRAM addressing"

    It doesn't have to be at the beginning - it just needs to be before any XRAM reference that requires it.

    Of course, having it at the beginning does guarantee that - but it is not mandatory.

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  • 0 in reply to ²erik malund

    "make a local, renamed copy of startup.a51"

    Renaming it is a preference - not mandatory.

    Having it local is also a preference (and one that I'd share) - not mandatory.

    "at the beginning set all SFRs that affect XRAM addressing"

    It doesn't have to be at the beginning - it just needs to be before any XRAM reference that requires it.

    Of course, having it at the beginning does guarantee that - but it is not mandatory.

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