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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)



Here's where I'm up to after some testing

To recap -

setb   ra.0
nop
clrb    ra.0

As described yesterday, ra.0 will go high, then low for 1 cycle,
then back to high, even though it's not been told to (by my s/w
anyway)

Adding

nop
clrb  ra.0

will make ra.0 do the pulse as it's meant to

Now I find this is repeatable on any ra pin, and tried that out
on 3 different SX batches (new date, AA, AB or AC). It matters
not a jot what is connected to the pin. And, furthermore, it doesn't
even have to be a clrb instruction to the same pin. Any pin
activity causes a proper clear. For example

setb   ra.0
nop
clrb     ra.0
nop
setb    ra.1

or even

setb    ra.0
nop
clrb     ra.0
nop
clrb     rb.0

PortB doesn't seem to suffer from the mysterious Phoenix-like
behaviour. Small comfort in this app because rb is used as an
8-bit wide input buss

I've d/led the latest SX18 manual - not a mention, so unless anyone
here has a clue I'll have to drop a line to Scenix. Although after their
last attempt to answer to a query I might as well ask the freakin' cat

Now that I'm aware of the nature and extent of the problem there
are some work-arounds I could try, but it'll be a thorough PITA
with the code timing so tight

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