On 2/9/2013 7:50 PM, IVP wrote:
> Hi Mitch,
>
> try running at 4MHz. I found that the F88's I2C flag SSPIF
> is faulty with 8MHz IntOsc. From memory I had to test BF
> instead, or drop to 4MHz
>
> Unfortunately Microchip have deleted all my tickets, including
> the one about SSPIF in which they acknowledge a silicon fault,
> the PICList post search isn't working and haven't time to do a
> full search of my own archives so I can't confirm it, but do recall
> that having to test BF meant I couldn't use the SSPIF interrupt
> like I wanted to
>
> AFAIK the problem is (still) undocumented
>
> Joe
>
Mitch, how long ago was that BF flag problem caught?  Microchip has
been bad about NOT admitting chip faults. Example? the last time the
eeprom array kept data properly was in the PIC16Cxxx series products.

Internal oscillators tend to "wobble" at high frequencies; I have seen
that in UART applications, too, so anything that needs to be precisely
timed will be affected. I think using an external oscillator (cer res or
xtal) should fix that.

--Bob A


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