Hi All,
I'm designing a new portable device and I would like to use the PIC18F2550 as a USB programming interface to a PIC18F452.
I've seen in the PICKIT or the PK2LITE circuits an analog circuit connected to ICD pin# 1.
I guess it produces the 12v for programming level (some uses the MAX662 instead).
my question is:
if I already have +15v in the circuit, can I use it instead? and don't build the analog part?
Another Question:
because I use the PIC18F2550 just as a USB programming interface, do I have to program it?
I've heard that I may not do it, the PIC18F2550 has internal program for this purpose . is it right??
The Pic18F2550 is capable of interfacing with USB. To be able to write code to do this needs a high level of ability.
I suspect, but may be wrong, that you have a USB programmer that you wish to use to program other pics. Please describe what you are trying to do and what hardware you have.
Hi Mike,
1) I have no programming HW, and you don't have to "suspect" me!
2) as I've written, I want to build a USB programmer like the PK2 ect...
I wonder what are all the analog transistors and FETs doing. and if I can omit this part by using an existed 15v.
The Pic18F2550 is capable of interfacing with USB. To be able to write code to do this needs a high level of ability.
I suspect, but may be wrong, that you have a USB programmer that you wish to use to program other pics. Please describe what you are trying to do and what hardware you have.
Hi Mike,
1) I have no programming HW, and you don't have to "suspect" me!
2) as I've written, I want to build a USB programmer like the PK2 ect...
I wonder what are all the analog transistors and FETs doing. and if I can omit this part by using an existed 15v.