I am not seeing POR problems. The cap was there because I copied part of my schematic from an earlier schematic that I used with a PIC 16C74A. My recollection was that I added the cap to that earlier design as a precaution rather than as a response to any sort of POR problem. ----- Original Message ----- From: "Kevin Olalde" To: Sent: Tuesday, April 10, 2001 6:04 AM Subject: Re: [PIC]: ICSP w/ PIC16F877 - problem solved > Was the cap there in the first place for POR considerations? And do you > now have that problem (again)? > > Kevin > > Nicholas Irias wrote: > > > > Getting rid of the cap on MCLR did the trick. I havent had any errors > > programming since I pulled it out. > > > > thanks for the help > > > > ----- Original Message ----- > > From: "Nicholas Irias" > > To: > > Sent: Monday, April 09, 2001 10:29 AM > > Subject: Re: [PIC]: ICSP w/ PIC16F877 > > > > > thanks. I'll try again with no cap and see it that does the trick. > > > > > > ----- Original Message ----- > > > From: "Roman Black" > > > To: > > > Sent: Monday, April 09, 2001 9:58 AM > > > Subject: Re: [PIC]: ICSP w/ PIC16F877 > > > > > > > > > > Nicholas Irias wrote: > > > > > > > > > > More on the configuration: > > > > > > > > > > My programming leads are 22ga wire, about 18" (~1/2 meter) long. > > > > > > > > > > RB6 and 7 are used only for programming. > > > > > > > > > > RB3 is not used. I have tried leaving it floating and also tying it > > to > > > > > ground via a 1K resistor, but still get the same error message. > > > > > > > > > > I am not using the low voltage programming mode. > > > > > > > > > > MCLR has .01uF cap to ground. It is pulled up to Vcc via a 47K > > resistor > > > in > > > > > series with a diode to allow MCLR to go to 13 volts for programming. > > > > > > > > > > > > I think you have it there. You have a 470 ohm series > > > > resistor and .01uF cap RC network. Bad. :o) > > > > Try removing the cap totally (bst), or shorting > > > > the resistor. > > > > > > > > Microchip are sketchy about the actual timing > > > > the Picstart uses for MCLR (RESET->VPP) > > > > and I think the program and verify timings are > > > > different. You may be getting good programming > > > > and bad verifying. Either way you need to mod > > > > that cap so MCLR can get to VPP very quickly. > > > > -Roman > > > > > > > > -- > > > > http://www.piclist.com hint: The PICList is archived three different > > > > ways. See http://www.piclist.com/#archives for details. > > > > > > > > > > > > > > -- > > > http://www.piclist.com hint: The PICList is archived three different > > > ways. See http://www.piclist.com/#archives for details. > > > > > > > > > > -- > > 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 > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body