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Registered Member #2008
Joined: Tue Mar 03 2009, 05:11AM
Location: USA, Frederick, MD
Posts: 118
Hello. I stumbled on another problem. I started to build a PIC programmer and geathered all the parts and I am almost done.
This programmer can program everything up to 18 pins. THe design came from this website:
PIC18F4550 has 40 pins. Can I use this same circuit to burn the 40 pin pic18?
All pics should have the nearly-same protocol, but I am not sure how to modify by circuit and connect it with jumper wires to the breadboard so I can program this PIC.
Here is a pic184550 pinout.
Here is the pinout for pic16f84 :http://www.best-microcontroller-projects.com/
image-files/chip-pinout-16f84.png
The programmer is universal so it is kinda hard to get what pins really need the signal/voltage/ground at the time of programming.
Solving this mystery by laying pic12 and pic18 over the circuit to find the right pind doesn't work. The eight PIC12 pins are so multifunctional that it is very hard to understand how that circuit even works.
Should I build another programmer for pic18?
Thank you for your time.
Is this the fundamental circuit for a programmer I am seeking? (second one from the bottom)
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Go to the microchip website and look up a document called "Flash Microcontroller Programming Specification" that applies for your chip, it will tell you what pins to use and what types of programming it supports.
Even better, get a PICkit 2 It can be had for cheap on ebay and other places and will make your life a lot easier. Home made programmers generally are a pain, particulary on modern computers. They tend to refuse to work with some chips and cause a lot of frustration.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
It does and it even has a programmable voltage output for driving small projects at different voltages and a 3 channel logical analyser among other features.
Have a look for example here: ,739,786&Prod=PG164120
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Programming PIC controller PIC18 using a PIC16 hardware.
