piclist 2003\01\30\155449a >
Thread: Pin won't turn off properly
www.piclist.com/techref/ubicom/devices.htm?key=sx
face picon face BY : Jinx email (remove spam text)



> Have you tried placing a putting a dummy load in place of the '123?

Yes. It doesn't matter what is attached (or not) to the pin, it
does the same thing. I'm wondering if there's some kind of
reflection going on, yet a.0 drives 60ns pulses into a 30cm
wire going to a level-shifting buffer with no problems at all

BTW the last lines of the original post should have been

        setb    s_ack         ;send acknowledge
        nop
        nop
        clrb    s_ack
        nop
        clrb    s_ack

The final s_ack got mislaid in the c&p.

What is interesting (I'll use "interesting" because I'm bored
with expletives) is that with or without the second clrb, the pin
does go low when required, but the second clrb seems to
reinforce the first, and the pulse is the correct length, ie does
not go L-H-L-H-L, but L-H-L. In the original pulse wave, the 1
cycle low before going high again is a real worry because
there's no code possible to make this pattern

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