Mark, everything does seem all right beside the crystal. Are you SURE it is 220 MHz? If it is, its way out of boundary; the 877 is to be used at a maximum frequency of 20MHz, anything lesser would also work. Try using a crystal of 20Mhz or less. Cheers, Anand. ----- Original Message ----- From: Ken Robertson To: Sent: Tuesday, January 23, 2001 10:00 PM Subject: (PIC): Possible miswiring of my board... input please? > Last night, I was trying other things to simply see that my PIC was working, > since I lacked the MAX232 to work with my 877. I noticed that nothing was > working (turning on a LED, writing something to eeprom), so I think I might > have wired it wrong, but don't know how it should be. Could someone maybe > spot a problem and tell me? > > I'm using the 877 with the Warp-13 programmer, CCS compiler, and PICProto64 > board from meLabs. For power, it has 11v coming in from a AC-DC adapter, > regulated with a 7505 with a 10uf cap on the incoming power line and a .1uf > cap on the regulated line. I have checked it, and regulated power is going > through the board fine. > > The crystal is where I think it might go wrong. The crystal is from Jameco > and is the CY20. It is placed with a 22pf cap on either side. Is 22pf > right for a 220mhz crystal? I mainly question this because the Jameco > website/catalog just says "Series" in the impedance column. > > I am really new to PICs (haven't even gotten my first one working :). I'm > going to order a book, so that might help. Mainly need some schematics and > parts lists for a 877, so I know what is right for this chip. > > Thanks a lot for any help you can offer, > Ken > > -- > 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 PICList is archived three different ways. See http://www.piclist.com/#archives for details.