Hi! Try erasing the PIC first. Worked for me. Regards, Samo -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of mervin Sent: Tuesday, February 20, 2001 3:53 AM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [PIC] 16f84-10p or 04p Thanks Peter Just starting and didn't wont to mess up a chip, better safe than sorry. First attempt to program using just built NOPPP and Demof84.hex failed. Error: expecting 0x000, found 3fff. I had already taken a 6' db25 cable and cut it down to 30", guess it wasn't enough. Just about to make one as short as possible and try it again soon. ----- Original Message ----- From: Peter Betts To: Sent: Monday, February 19, 2001 4:53 AM Subject: Re: [PIC] 16f84-10p or 04p > > but will I run into > > any problems > > programming a 10 mhz as a 4 mhz chip? > > Run it a 1Hz if you like, it doesn't matter. > > The speed specification of the chip only limits the MAXIMUM operating speed > not the minimum (there are limits, some processors aren't true DC, static > devices, most are) > > You don't program the PIC to be 4MHz or 10MHz it just is by design of the > hardware circuit you have chosen. > > A 4MHz PIC will work identically to a 10MHz PIC when they are both clocked > at 4MHz. > > This would NOT be true if you tried to use a 4MHz device and clocked it at > 10MHz because you have gone above the recommended MAXIMUM operating > frequency. > > A higher speed specification device is always backward compatible in a > circuit running at a lower speed. Don't worry. > > The only slight difference is in the crystal setting in the programmer. > XT,HS etc. At both 4MHz and 10MHz you'll be able to use XT for both. Only > when you go up to 20MHz say would you need the HS. > > Pete > > -- > 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 hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu