Post by thread:[PIC:] upward from 16F628?

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Monday 08 March 2004 13:14, you wrote: > Greetings, > > I've hit the code size (and in a few cases speed) wall with the 16F628. > Can anyone suggest a PIC which is pin compatible but has >4K of code > space (and ideally, but not necessarily, can be run at >20MHz)? > I don't think that you're going to find a 'pin-compatible' one with those specs.. >20MHz would imply 18F parts and IIRC, they're not pin-compatible with the '628.. You'd best use a 18F PIC, which might help you reduce your code size as it has a larger instruction set.. and it runs at 40MHz.. the 18F1320 has 4K word, and has 18pins (although not compatible with '628).. with metta, Shawn Tan. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQFATAYn9KUEj/m6O5oRAhrrAJ9Cfchpk7bSWuOEz5Z75pWPRxyEowCfeSl3 d1k0crqiTMkqSPqmDoLSr8o= =wJc4 -----END PGP SIGNATURE----- -- 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

The just-released PIC16F648 will handle the code space, and more ram, too. Theoretically, 20M is the fastest you can run. But most of the chip will run MUCH faster, as long as it is kept at room temp..,. also the internal oscillator will fade away after about 25M. Do some testing. --Bob Darren Gibbs wrote: {Quote hidden}> Greetings, > > I've hit the code size (and in a few cases speed) wall with the 16F628. > Can anyone suggest a PIC which is pin compatible but has >4K of code > space (and ideally, but not necessarily, can be run at >20MHz)? > > thanks, > > darren > > -- > 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 > -- Replies: NOTE-Script, EXE,BAT and COM files will be rejected by server -------------- Bob Axtell PIC Hardware & Firmware Dev http://beam.to/baxtell 1-520-219-2363 -- 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

> I've hit the code size (and in a few cases speed) wall with > the 16F628. > Can anyone suggest a PIC which is pin compatible but has >4K of code > space (and ideally, but not necessarily, can be run at >20MHz)? - 16F648A has 4k, almost compatible - all 16F's max out at 20 MHz - 18F's can run at 40 MHz, but not compatible (16-bit instructions) - Ubicom SX can run at 75 MHz (compares to 300 MHz PIC!), but not compatible (12-bit instructions) Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- 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

Wouter van Ooijen wrote: > - all 16F's max out at 20 MHz Just for everyone's PIC trivia information: ------------------------------------------- I was very surprised myself that this is not true anymore. Believe it or not, some of the newer versions of the older PIC16C5X baseline parts are touted by Microchip to run at 40 MHz. This is in the PIC16C5X EPROM/ROM-Based 8-bit CMOS Microcontroller Series Data Sheet (DS30453D): Operation between 20 to 40 MHz requires the following: VDD between 4.5V. and 5.5V OSC1 externally driven OSC2 not connected HS mode Commercial temperatures Devices qualified for 40 MHz operation have -40 designation (ex: PIC16C54C-40/P). Interesting, I never thought I'd see this day with the older baseline parts. Best regards, Ken Pergola -- 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

On Mon, 8 Mar 2004, Wouter van Ooijen wrote: > > I've hit the code size (and in a few cases speed) wall with > > the 16F628. > > Can anyone suggest a PIC which is pin compatible but has >4K of code > > space (and ideally, but not necessarily, can be run at >20MHz)? > > - 16F648A has 4k, almost compatible > - all 16F's max out at 20 MHz all 16F628/20MHz supplied at 5V are running at 25MHz, much better with external oscillator but also in (tested) HS mode. > - 18F's can run at 40 MHz, but not compatible (16-bit instructions) > - Ubicom SX can run at 75 MHz (compares to 300 MHz PIC!), but not > compatible (12-bit instructions) > SX52BD 100MHz ? -- 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

{Quote hidden}>-----Original Message----- >From: Vasile Surducan [spam_OUTvasileTakeThisOuTS3.ITIM-CJ.RO] >Sent: 08 March 2004 07:52 >To: .....PICLISTKILLspam@spam@MITVMA.MIT.EDU >Subject: Re: [PIC:] upward from 16F628? > > >On Mon, 8 Mar 2004, Wouter van Ooijen wrote: > >> > I've hit the code size (and in a few cases speed) wall with the >> > 16F628. Can anyone suggest a PIC which is pin compatible >but has >4K >> > of code space (and ideally, but not necessarily, can be run at >> > >20MHz)? >> >> - 16F648A has 4k, almost compatible >> - all 16F's max out at 20 MHz > > all 16F628/20MHz supplied at 5V are running at 25MHz, much >better with external oscillator but also in (tested) HS mode. > >> - 18F's can run at 40 MHz, but not compatible (16-bit instructions) >> - Ubicom SX can run at 75 MHz (compares to 300 MHz PIC!), but not >> compatible (12-bit instructions) >> > SX52BD 100MHz ? I don't think the 100MHz parts are available. I vaguely remember that they had some issues and never made it to full production. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to postmasterKILLspambookham.com. -- 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

Vasile Surducan wrote: > > all 16F628/20MHz supplied at 5V are running at 25MHz, much better with > external oscillator but also in (tested) HS mode. I've had success here, too. I'm doing a timing generator design at 25Mhz using the 5V PIC12F629 SOIC8. It even works in the DIP package- but in my experience, SO always beats a DIP. I'm using Epson's cylindrical (CA301) crystals with 22pf caps. To be safe, I'm making a jig to test the PICs before installing them... Also, careful PCB layout is pretty important to success at very high speeds. I make the CA301 laydown with its leads being bathed in the solder of the 0805 22pf caps. Keeps the capacitance very low. NOTE: SMD crystals add a lot of capacitance to the loop; don't use 'em. --Bob -- Replies: NOTE-Script, EXE,BAT and COM files will be rejected by server -------------- Bob Axtell PIC Hardware & Firmware Dev http://beam.to/baxtell 1-520-219-2363 -- 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