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How to access upper 128B RAM on ADuC814 using Keil in C?

Tomek H

Hi.

I have a feeling, Keil is using only lower 128Bytes Data space of my ADuC814.
The ADuC manual says, it has a lower RAM (00H - 7FH), and upper RAM (80H - FFH). The upper RAM is addressable by indirect adressing.
Can anyone write one line as example, how should I make it in C for Keil? Do I need to change any other seetings?

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  • 0 in reply to Andy Neil

    When running out of 'data' space do not willy-nilly change some variables to 'idata'. The access of an idata variable is slower than the access of a data variable

    First check arrays (data/idata makes no difference unless addressed by fixed offsets). Then find some rarely used variables and change them. then ... well you should have gotten the drift by now.

    Erik

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  • 0 in reply to Andy Neil

    When running out of 'data' space do not willy-nilly change some variables to 'idata'. The access of an idata variable is slower than the access of a data variable

    First check arrays (data/idata makes no difference unless addressed by fixed offsets). Then find some rarely used variables and change them. then ... well you should have gotten the drift by now.

    Erik

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