Hi Brent many thanks for your interest and suggestion, I have read the documentation about the BODEN, but sincerely I do not have understand its meaning. If the actual circuit work with 5 Volt, why I need to change the BODEN when I work with a low voltage? Best regards ----- Original Message ----- From: "Brent A. Crosby" To: Sent: Wednesday, May 29, 2002 4:17 PM Subject: Re: [PIC]:Powering the 16F877 with a 3.5 V, no quartz oscillate. Did you turn BODEN off? --- Original Message --- >From: "Leo Dep" >To: >Sent: Wed, 29 May 2002 14:47:11 +0200 >Subject: Re: [PIC]:Powering the 16F877 with a 3.5 V, no quartz oscillate. > >Hi PIClist friend, > >I have a working 16F877 powered with a 5VDC, with a 20 Mhz quartz. > >Powering the same circuit with a 3.5 VDC, the PIC refuse to start. > >Looking with a scope on pin 14, the quartz of 20 Mhz, it oscillate with an >amplitude betveen the 0,8 and 1,9 Volt, and on pin 13 a fixed level of 1,2 >Volt. > >If I change the quartz with one of 8 Mhz, I obtain a bigger oscillation >signal, mat not suficient to start the PIC. > >I have some spare 74HC14 available, it can be useful? > >Regards > >Leo -- 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.