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constant placement

Mustafa Kara

Can I put ?CO?xxx on XDATA space using LX51 user segments "?CO?xxx (X:0x200)"

thx all

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  • 0 in reply to Andy Neil

    "xdata is a RAM space isn't it."

    Not necessarily.

    As far as the processor is concerned, XDATA is just memory that responds to MOVX opcodes; so, if you connect some ROM so that it responds to (i.e. is accessed by) MOVX opcodes, you have ROM in XDATA space.

    expanding on this:
    the most frequent case I know of using "burned constants in XDATA" is in the cases where you use a negative OR to convert the '51 to vonNeuman memory.

    Erik

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  • 0 in reply to Andy Neil

    "xdata is a RAM space isn't it."

    Not necessarily.

    As far as the processor is concerned, XDATA is just memory that responds to MOVX opcodes; so, if you connect some ROM so that it responds to (i.e. is accessed by) MOVX opcodes, you have ROM in XDATA space.

    expanding on this:
    the most frequent case I know of using "burned constants in XDATA" is in the cases where you use a negative OR to convert the '51 to vonNeuman memory.

    Erik

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