Post by thread:[PIC:] 18F errata issues

Ok, with all the various issues wit the 18F parts, which ones actually work as advertised? If I understand correctly: 18Fx58 have a problem crossing the h4000 boundary 18Fxx20 are unreliable above 4mHz Right? Is that all... or is there more I'm missing? Which 18F parts actually work as advertised? I don't want to be down on Microchip, I've been using 16F parts for a couple years without significant problem. But now I have a project that needs more horsepower than the 16F877 can give me. -Denny -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Well, it's Saturday evening, isn't it... Denny Esterline wrote : > 18Fxx20 are unreliable above 4mHz Ouch, and *I* thought it was above 4 *Mega* Hertz ! Jan-Erik. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

Ok, with all the various issues with the 18F parts, which ones actually work as advertised? If I understand correctly: 18Fx58 have a problem crossing the h4000 boundary 18Fxx20 are unreliable above 4MHz Right? Is that all... or is there more I'm missing? I don't want to be down on Microchip, I've been using 16F parts for a couple years without significant problem. But now I have a project that needs more speed than I can get with the 16F877. -Denny -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Hi Denny, The PIC18F452 would be a good upgrade choice for the PIC16F877 in my opinion. I would start with the C0 errata devices if you can get them (I hope they are out on the distributor's shelves by now). The PIC18F452, *seems* to me one of the more mature PIC18F devices, but you would really have to spend the time perusing the errata documents or contact Microchip to make the determination yourself. Good luck Denny. Best regards, Ken Pergola -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

I can add to this that the 18Fxx20 skips instructions after TBLRD at random, you need to insert at least two NOP instructions (I used dw 0xfff). This cost us several days and is not in the errata. Robin {Original Message removed}

On Mon, 3 Nov 2003, Robin Abbott wrote: > I can add to this that the 18Fxx20 skips instructions after TBLRD at random, > you need to insert at least two NOP instructions (I used dw 0xfff). You saw this on an 18Fxx20, not an 18Fxx2, where it is a documented errata? -- John W. Temples, III -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Sorry PIC18F1320 Robin ----- Original Message ----- From: <piclistKILLspamXARGS.COM> To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent: Monday, November 03, 2003 10:20 PM Subject: Re: [PIC:] 18F errata issues > On Mon, 3 Nov 2003, Robin Abbott wrote: > > > I can add to this that the 18Fxx20 skips instructions after TBLRD at random, {Quote hidden}> > you need to insert at least two NOP instructions (I used dw 0xfff). > > You saw this on an 18Fxx20, not an 18Fxx2, where it is a documented > errata? > > -- > John W. Temples, III > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > -- 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