Tried that, still having the same problems... /frax ----- Original Message -----=20 From: "Denis Seguin" To: Sent: Tuesday, August 06, 2002 9:55 PM Subject: Re: [PIC][EE]: Unstable circuit > HI, >=20 > ADD 0.1uF on MCRL and GND (Recommend By Microchip), and 0.1uF on Each = VCC > Pin. >=20 > 5 > / > \ 10K > / > \ > ----------MCRL > | > | > -- > -- 0.1uF > | > | > GND >=20 >=20 >=20 > Denis >=20 >=20 > ----- Original Message ----- > From: "Fredrik Axtelius" > To: > Sent: Tuesday, August 06, 2002 3:35 PM > Subject: Re: [PIC][EE]: Unstable circuit >=20 >=20 > Yes, of course it's a typo :) > I have both Vdd to +5 and both Vss to GND. > /MCLR is pulled up with a 10k resistor (also tried 1k). >=20 > Still having exactly the same problems. >=20 > Any more ideas? >=20 > /frax >=20 > ----- Original Message ----- > From: "Derek Cowburn" > To: > Sent: Tuesday, August 06, 2002 4:53 PM > Subject: Re: [PIC][EE]: Unstable circuit >=20 >=20 > > > > I have tried to put +5 on either and both of the VDD pins, > > > same thing with > > > the VSS. > > > > +5 to both Vdd. Vss to Ground (not +5). Typo? > > > > I had a similar problem and it was the /MCLR was not pulled high = like Mike > > indicates below. Same "touch it and it resets" effect. > > > > -Derek > > > > > > > -----Original Message----- > > > From: Mike Pink [mailto:mjpink@KINGSTAG.COM] > > > Sent: Tuesday, August 06, 2002 2:21 AM > > > To: PICLIST@MITVMA.MIT.EDU > > > Subject: Re: [PIC][EE]: Unstable circuit > > > > > > > > > You don't mention -mclr > > > > > > Pull it up to Vdd with a 4k7 resistor > > > > > > Mike > > > > > > > > > > > > ----- Original Message ----- > > > From: "Fredrik Axtelius" > > > To: > > > Sent: Monday, August 05, 2002 11:59 PM > > > Subject: [PIC][EE]: Unstable circuit > > > > > > > > > > Hi!! > > > > > > > > I have a PIC16F877 circuit and im having big problems to > > > get it stable. > > > > > > > > Problem: > > > > It will only run for a short time and only if im touching > > > GND with one > > > hand. > > > > When I touch GND with one hand all I have to do is wave the > > > other hand a > > > few inces from the circuit to get it to reset, now if I keep that = hand > > > really still I can watch it run for like 5-10 secs before it > > > lock ups (not > > > resets). > > > > > > > > Hardware: > > > > All I have is a 4Mhz 16f877, osc caps are 27p > > > > One LED on RC4 with a resistor to GND. > > > > Max232 with all the caps on RC6 and 7. The other end of the > > > max232 is > > > connected to my com1. > > > > A reset button with a 10k pullup resistor. > > > > All my cables are short and nicely layedout and my > > > powersupply delivers a > > > stable +5v. > > > > > > > > What I have tried so far: > > > > I have tried to put +5 on either and both of the VDD pins, > > > same thing with > > > the VSS. > > > > I have put caps between none, either or both of the VSS/VDD = pins. > > > > I disconnected the Max232 on rc6 and rc7, still the same = problem. > > > > I tried a 16f874 at both 20 and 4Mhz, same thing. > > > > > > > > Help me! > > > > /Fredrik > > > > > > > > -- > > > > http://www.piclist.com hint: PICList Posts must start with > > > ONE topic: > > > > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other > > > [BUY]:,[AD]: ->Ads > > > > > > > > > > > > > > -- > > > http://www.piclist.com hint: The list server can filter out = subtopics > > > (like ads or off topics) for you. See = http://www.piclist.com/#topics > > > > > > > > > > -- > > http://www.piclist.com hint: The list server can filter out = subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > >=20 > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics >=20 > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics >=20 >=20 > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics