Hi Bob, I just opened up an unused tube and pulled one out a PIC16F877-04/P Date Code 9939M10 and read the configuration fuses on my PSP: Oscillator: XT WDT: ON PWRTE: OFF CP: 1F00-1FFF BODEN: ON LVP: OFF DATA EE Protect: OFF Flash Program Write: OFF Background Debug: Disabled I know this isn't 0x03FFF, but it is representative of what I have seen w= ith the PIC16F87x parts. Maybe I have older date codes but to get LVP workin= g, I have had to program PIC16F87x's with: __CONFIG _CP_OFF & _DEBUG_OFF & _XT_OSC & _PWRTE_ON & _WDT_OFF & _LVP_O= N & _WRT_ENABLE_ON & _BODEN_ON & _CPD_OFF before I could use LVP. myke ----- Original Message ----- From: "Bob Ammerman" To: Sent: Sunday, June 17, 2001 11:05 PM Subject: Re: [PIC]: Programming 16F87X > No! > > From the factory chips come in LVP_ON mode. > > Bob Ammerman > RAm Systems > (contract development of high performance, high function, low-level > software) > > ----- Original Message ----- > From: "myke predko" > To: > Sent: Sunday, June 17, 2001 10:44 PM > Subject: Re: [PIC]: Programming 16F87X > > > > > Hi =C5keN, > > > > > > What it is saying is that before you can take advantage of Low Volt= age > > > programming, you have to first program the PICmicro (with a high > programming > > > voltage - 12+ Volts) with the LVP bit reset. > > > > So I have to programmed first _LVP_ON and > > then_LVP_OFF ? Do You mean so or?? > > No. You just have to program at high voltage to be able to change the > configuration fuse from _LVP_OFF to _LVP_ON. > > Good luck, > > myke > > -- > 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 > > > -- 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