Re-entrant interrupt on the 80C51

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Fred Contact options for registered users 's Avatar (by Gravatar) posted on
May 8, 2006, 2:44 pm
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I see the HIP and LIP bits in the STATUS sfr are read only.  Feel it's a bit
of a shame!

Is there any way around this?



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Ian Bell Contact options for registered users 's Avatar (by Gravatar) posted on
May 9, 2006, 5:50 am
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Re: Re-entrant interrupt on the 80C51



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Which 8051 variant is this?

Ian

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Fred Contact options for registered users 's Avatar (by Gravatar) posted on
May 9, 2006, 8:59 am
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Re: Re-entrant interrupt on the 80C51



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It's the Dallas DS80C400 part.

I've managed to do it in more a fudge like manner where I wrote an embedded
piece of assembler where I stacked a label (3 bytes for this part) and
called an RETI.  That then resets the LIP bit.  Shame it's read only and you
have to use this method.



Fred Contact options for registered users 's Avatar (by Gravatar) posted on
May 9, 2006, 9:00 am
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Re: Re-entrant interrupt on the 80C51



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It's the Dallas DS80C400 part.

I've managed to do it in more a fudge like manner where I wrote an embedded
piece of assembler where I stacked a label (3 bytes for this part) and
called an RETI.  That then resets the LIP bit.  Shame it's read only and you
have to use this method.




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