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ST10F168 : Internal/External address bus

Joffrey Kriegel

Hello,

I'm currently working on the ST10F168 and I'm using the external bus to control some RAMs.

But when I don't use the external RAMs, the external address bus is still changing.

So I would like to know if it's normal, and if it is the same bus which is connected to the external RAMs and to the internal RAM.

If it's the case : if I make an access to an internal address, can the address be seen on the external bus too ?

Thanks.

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    Hello,

    In general it is not normal but probably you left settings untouched when moved to the no-external-RAM version. Check BUSCON/SYSCON/ADDRSEL registers. Start looking into an *.a?? asm file in your project.

    If you have access to internal RAM it does not mean you should see the life on external bus until intentionally use Visible Mode for XBUS peripheral, check SYSCON.

    Regards,
    Nikolay.

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  • 0

    Hello,

    In general it is not normal but probably you left settings untouched when moved to the no-external-RAM version. Check BUSCON/SYSCON/ADDRSEL registers. Start looking into an *.a?? asm file in your project.

    If you have access to internal RAM it does not mean you should see the life on external bus until intentionally use Visible Mode for XBUS peripheral, check SYSCON.

    Regards,
    Nikolay.

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