Hi,
I am working on interfacing a BQ3285EP real time clock IC to a micromint 80C52 processor.
I have done a *lot* of projects with the 80C52 w/BASIC, all kinds of I/O.
Here's the problem:
I can verify that I can progam the control registers- I can tell because I can set the bits to activate the squarewave output.
I cannot read the registers for some reason. Not the control registers, not the time / date registers. The interface waveforms look ok with my logic analyzer. I am getting FF for any read of the registers.
Data sheet:
http://focus.ti.com/docs/prod/folders/p ... 3285e.html
This is for a home project, so I can't push TI tech support much...
Thank you,
Dave
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Real time clock interface / coding
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