> You need a way to detect when DO is floating, rather than
> hide it.
>=20
> When floating, the signal will stay at the same level for some
> time. It will swing if it is driven or has a resistor.  Does your
> dsPIC have software switchable pull-down resistors?

Having another look at the PCB to refresh my memory, DO
has, and always has had, a 47k pull-up to Vcard. ISTR the
actual recommended value is 50k

Joe


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2015.0.5751 / Virus Database: 4315/9406 - Release Date: 03/29/15

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.