Where to buy a 68HC705 programmer? - Page 1
Forum section: electronics / general

author: nctnico
author_rank: Super Contributor
timestamp: November 08, 2013, 05:40:21 pm
content: Today I got a call from a former employer. He asked if I knew where to get an 68HC705 programmer (DIP package). He has some legacy products which he needs to produce every now and then. Google didn't come up with any answers (except for some discontinued products) and even the Galep5 from Conitec doesn't seem to support this controller. Does anyone know a programmer? Preferably one which doesn't break the bank

author: Clint
author_rank: Regular Contributor
timestamp: November 08, 2013, 05:43:22 pm
content: You can make an adaptor for most eprom programmers, I am sure the pin out is also the same on a 68701, I used to program both using a Dataman S4 for UK Ford RS Turbo Cars.

author: quarks
author_rank: Frequent Contributor
timestamp: November 08, 2013, 05:53:17 pm
content: I think Elnec + Xeltek have several programmers which support them. Also I saw Conitec Galep-4 has MC68HC705C8A DIP 40 on the supported device list.

author: nctnico
author_rank: Super Contributor
timestamp: November 08, 2013, 08:44:43 pm
content: The Galep-4 it is then. Its weird they dropped the support for the 68HC705 on the Galep5. I did check the device list of the Galep-5 before posting.

author: Kjelt
author_rank: Super Contributor
timestamp: November 08, 2013, 09:21:59 pm
content: Incredible that you can still buy these uC's or did he have them in stock?

author: nctnico
author_rank: Super Contributor
timestamp: November 08, 2013, 10:24:25 pm
content: Farnell still sells them at €10 each.

author: trackman44
author_rank: Regular Contributor
timestamp: November 09, 2013, 04:39:57 am
content: Here's a website for a DIY build for 68HC705C8 :-http://midondesign.com/PROG05/PROG05.htmlHope this helps.Will

author: westfw
author_rank: Super Contributor
timestamp: November 12, 2013, 11:32:48 am
content: IIRC, the 68hc705 was one of those chips that included some "Rom monitor" functionality ST if you started it with the right cystal and strapping, you could speak async to a tiny bit of code. And that tiny bit of code could be used to load some code into RAM that could bootstrap the rest of the chip, or something like that.Trying to find the details, it seems that they depended on exactly which chip you have.

author: amyk
author_rank: Super Contributor
timestamp: November 12, 2013, 12:01:17 pm
content: Quote from: westfw on November 12, 2013, 11:32:48 amMany of the Motorola MCUs had that, the '705 only has a very simple one (the 9S12 series has a much more elaborate monitor ROM.)

author: Didier9
author_rank: Newbie
timestamp: November 12, 2013, 09:56:26 pm
content: I have made one a long time ago, and I wrote a loader in QuickBasic that ran in a DOS window (Command window) under XP.Have not used it myself in a long time though.I used mostly the EEPROM versions like the 68HC806B6 and 68HC805C4 because you did not need the UV eraser therefore it was considerably faster and more convenient, but the process was very similar as described: use the built-in code to load a programmer in RAM and feed your data through the serial port.I have the code somewhere, we still use it where I work...

author: westfw
author_rank: Super Contributor
timestamp: November 13, 2013, 10:08:22 am
content: My point is that in modern day times, given things like Arduino and high level programming languages, it should be possible to build an 68HC705 programmer in a couple of days, without even needing a PCB. It doesn't require lots of wires switched at inconvenient voltages, or very tight timing...

author: nctnico
author_rank: Super Contributor
timestamp: November 13, 2013, 11:25:37 am
content: If I need to build a programmer its probably just as easy to change the design for a more modern microcontroller.The Galep4 needs a real parallel port to work so that could be a show stopper. The hard part of these kind of projects is to get the file into the programmer. Two decades ago I build an eprom emulator which emulated a printer. That way I could send it commands and hex files by just 'printing' to it. I bet it works with an USB to parallel printer adapter as well.edit: typo

author: jeroen74
author_rank: Frequent Contributor
timestamp: November 13, 2013, 11:51:51 am
content: I have one... unused kit from Motorola, with printed appnotes and a thingy called a 'floppy disc'....