Post by thread:[PIC]: 8-pin parts

Hello, I'm wanting to develop a very small application using an 8-pin PIC. I think a 12C508A at 4MHz internal oscilator would be enough. Can I buy a couple of PIC12CE674-10-JW just for my development (as long I don't use more than 512 bytes program memory, etc) and later use the same code on the OTP 12C508 parts? There's some incompatibility I need to know? I have the CCS-PCM. The manual says only the PCB support the 12 bit opcodes, but it cames with the 12C50X.H files. Is the manual wrong? Or I cannot use this .H files? Can a program made for the 12C508 be run on the 12CE674 without modifications? Best regards, Brusque ----------------------------------- Edson Brusque Research and Development C.I.Tronics Lighting Designers Ltda (47) 323-2138 / (47) 9993-6453 Blumenau - SC - Brazil http://www.citronics.com.br ----------------------------------- -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

----- Original Message ----- From: Edson Brusque <.....ebrusqueKILLspam@spam@TERRA.COM.BR> > Can I buy a couple of PIC12CE674-10-JW just for my development (as long > I don't use more than 512 bytes program memory, etc) and later use the same > code on the OTP 12C508 parts? [...] > There's some incompatibility I need to know? > Can a program made for the 12C508 be run on the 12CE674 without > modifications? No. On the 12x6xx series, the A/D setup must be changed on init, or else GPIO will be mostly analog ins. I don't think there is a 12x5xx that has A/D. IIRC, the register memory organization is different too. Jeff demaagd.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

At 07:33 PM 5/15/01 -0300, Edson Brusque wrote: >Hello, > > I'm wanting to develop a very small application using an 8-pin PIC. I >think a 12C508A at 4MHz internal oscilator would be enough. > > Can I buy a couple of PIC12CE674-10-JW just for my development (as long >I don't use more than 512 bytes program memory, etc) and later use the same >code on the OTP 12C508 parts? > > There's some incompatibility I need to know? I may miss something here, but you should be OK so long as you observe the following: 2 level stack no addwf of subwf instrctions anything that modifies PCL must start within first 256 bytes of code space on each page: jump tables, subroutines, etc. Only 1 code page on 12c508. when returning from a subroutine, only option is retlw xx. You cannot return from a sub with a variable in W - only a literal. port tris bits are programmed using the TRIS command. You cannot read the TRIS register - it is write only. Only 25 bytes of RAM I may have forgotten something else - this is just off the top of my head. dwayne Dwayne Reid <.....dwaynerKILLspam.....planet.eon.net> Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 17 years of Engineering Innovation (1984 - 2001) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body