Post by thread:[PIC]: Program on external flash memory

Hi, Is it possible to run a PIC from the program in an external flash? I'm thinking of the possibility of a firmware sitting in the PIC that grabs the program from a flash chip. It would be especially useful for developing programs for OTP PICs minus the cost of a JW part and eprom eraser. Regards, Tan -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Tan Chun Chiek > Hi, > Is it possible to run a PIC from the program in an external flash? I'm > thinking of the possibility of a firmware sitting in the PIC that grabs the > program from a flash chip. It would be especially useful for developing > programs for OTP PICs minus the cost of a JW part and eprom eraser. 39541a.pdf PIC18C601/801 High-Performance ROM-less Microcontrollers with External Memory Bus about 4 $ retail. Mike. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

Thank you, but i'm particularly interested in the 16c765/745 for its USB features Tan ----- Original Message ----- From: "Mike Singer" <msingerKILLspamPOLUOSTROV.NET> To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent: Wednesday, November 06, 2002 1:17 PM Subject: Re: [PIC]: Program on external flash memory {Quote hidden}> Tan Chun Chiek > > Hi, > > Is it possible to run a PIC from the program in an external flash? > I'm > > thinking of the possibility of a firmware sitting in the PIC that > grabs the > > program from a flash chip. It would be especially useful for > developing > > programs for OTP PICs minus the cost of a JW part and eprom eraser. > > 39541a.pdf > PIC18C601/801 High-Performance ROM-less Microcontrollers > with External Memory Bus about 4 $ retail. > > Mike. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

I believe the 17 series are the only ones that can run with external program memory. Another way to do it would be to have a boot loader that runs on a flash PIC, reads a program off an external chip, and programs itself. I think this might have been mentioned on the list before. Of course, unless you need very specific hardware peripherals (such as an LCD driver), why not just go to a flash based PIC and ICSP or ICD? Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams Tan Chun Chiek wrote: > > Hi, > Is it possible to run a PIC from the program in an external flash? I'm > thinking of the possibility of a firmware sitting in the PIC that grabs the > program from a flash chip. It would be especially useful for developing > programs for OTP PICs minus the cost of a JW part and eprom eraser. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

> Is it possible to run a PIC from the program in an external flash? Only a few 17 and 18 series PICs can do this. Microchip calls this "microprocessor mode", as apposed to "microcontroller mode". ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body