piclist 2003\01\31\024818a >
Thread: Pin won't turn off properly
www.piclist.com/techref/ubicom/devices.htm?key=sx
picon face BY : Stephen email (remove spam text)



I still think you are seeing a read-modify-write issue. Have you tried 2
nops between the setb and clrb? It's possible that port a has some
slightly longer propogation delays that may explain it's different
results from other ports.

Also, what type load is being driven? I high capacitive load (long
traces?) could explain this behaviour.

The PORTRD bit was added in the SX48/52 to help combat this behaviour.
It enables the port latch to be read instead of the pin (as on the
SX18/20/28), so getting around the problem of a slow ramp on an output
pin.

{Original Message removed}
<000901c2c8fc$eed78250$6601a8c0@shollandathome> 7bit

In reply to: <001501c2c8d5$d3d5f940$10a8a7cb@joe>
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Subject (change) Pin won't turn off properly

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