I rechecked all the grounds as you suggested, but they appear normal. It sounds like a really really good trick to know, and I'll be sure to remember it if I'm having problems in the future. thanks! ----- Original Message ----- From: To: Sent: Wednesday, April 14, 2004 9:59 PM Subject: Re: [PIC:] Odd behavior > > So can anyone fathom why it's being so picky? I've never had this > > problem before, and I really need to be able to use my scope to debug > > the coming code. > > Please help me figure this out.. it's killing me! > > These are classic symptoms of no direct connection of the GND > from the power supply to the micro. The second most common > cause of these types of symptoms is a broken/missing connection > that you are expecting to be low (like MCLR). Both a 0V and a no- > connect appear the same on the scope, so you start drawing the > wrong conclusions and then go into a hair pulling spiral. > Connect a 100k resistor between your scope probe tip and the 5V > supply (so it acts as a pullup) and recheck all the pins that you are > expecting to be at GND potential. If it's really connected, it will > appear low. If not, it will be high. > > Steve. > > ========================================== > Steve Baldwin Electronic Product Design > TLA Microsystems Ltd Microcontroller Specialists > PO Box 15-680, New Lynn http://www.tla.co.nz > Auckland, New Zealand ph +64 9 820-2221 > email: steve@tla.co.nz fax +64 9 820-1929 > ========================================= > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body