On Fri, Aug 15, 2008 at 5:01 AM, Olin Lathrop wrote: > Josh Koffman wrote: >> 1. Is it usual to use a pull up or pull down on the serial lines (CS, >> SCLK and DIN)? > > No, mostly. The clock, slave selects, and data output from master lines are > always driven. A pulldown or pullup resistor would only matter for a brief > time during system power up or when the PIC is programmed in circuit. > Usually the issue can be ignored during this time. Gotcha. > The data into master lines may not always be driven, and a pulldown on them > makes sense in that case. You need a resistor just low enough to keep the > line from floating when it's not driven, like 100Kohms. Ok, and since this is a listen only slave I'm using there is no data into master lines. Problem solved. Well, one of the problems solved. Still looking for more info on the audio input circuitry. I found a couple of websites that look promising but nothing concrete yet. Thanks! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist