James Paul <PICLIST@mitvma.mit.edu> wrote:

> I can see the correct data coming from the PIC except that it is
> only about 800mV high instead of 4.8+ V like the rest.  And this is
> only seen on the return data.   All other bit coming from the PC to
> the PIC and the acknowledge bit from the PIC to the PC are at the
> correct level (4.8+V). I just do not understand why the data going
> back to the PC from the PIC is such a small value and all the other
> bit are at the correct level.

James:

The acknowledge bit from the PIC to the PC is at 4.8V, but the other
"1" bits from the PIC to the PC are only 800mV?  Sounds as though the
PC is trying to hold the data line low while the PIC is sending data
to it.

-Andy

=== Andrew Warren -- aiw@cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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