I have a programmer for the 16F628 and I would like the jury-rig it to program a 684. Yes, I would be going from 18 to 14 pins, but I can cross wire the appropriate lines. Has anyone tried this before?
Thanks in advance.
"Marlowe"
cross
I suspect that pin wiring will be the least of your problems. Admittedly, I don't know the details of the 16F684's programming but I suspect that it will likely be incompatible with the 16F628. Some of the newer chips use an algorithm that requires the programmer to bring up Vcc _after_ Vpp. Not to mention the issues of _CONFIG word layouts etc.
That being said, I was able to hack my picall to program the 16F88 since it is very similar to a 16F819. Unfortunately, there seems to be no hope of my getting a 12F683 programmed with it though. A hopeless incompatibility. You might be luckier though. I really wish Microchip didn't have to act like Microsoft with this stuff, it can't really be necessary.
Anthony,
Thanks for your advice, but the further I look into it the more it might be doable. I have crossed mapped the pins on both chips. Also my MPLAB IDE and PPP packages support both chips. The only problem is my C2C compiler that generates an assembler file. I do have the 16F684.inc file that maps the 684 registers. I just successfully produced a hex file from a compiled
684 file for a 827 C file. I just might wire wrap up the translation HW next.Marlowe
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.