BootLoader for 16F872,16F877 | Piclist

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Hi all,

Here I m trying to make an Bootloader for 16F877 and 16F872.

I took the info form the http://www.microchipc.com/PIC16bootload/

When i made the circuit mentioned in the notes,it doesnot work.

Always have see the message "searching for the BootLoader.

What this Max3222 really do?

Any other BootLoader diagrams?

Thanks.

Ramesh

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max3222 is YARLD (yet another rs232 line driver). You definitely need something to convert rs232 to/fro TTL. go to the maxim site and read the datasheet. also, read the other current rs232 thread. You'll see in that link you gave that there are a ton of rs232/TTL converter circuits - too many, imo, for a beginner to see the forest. I'd recommend a simple max232 based approach since there is tons info on it. basically, your PIC needs to be able to do serial I/O for these bootloaders to work. and, yes, there are some that dont require serial I/O but ignore those for now - get your serial I/O working first. --- In , R Ramesh <ramesh_21_in@y...> wrote: > Hi all, > > Here I m trying to make an Bootloader for 16F877 and 16F872. > I took the info form the http://www.microchipc.com/PIC16bootload/ > > When i made the circuit mentioned in the notes,it doesnot work. > Always have see the message "searching for the BootLoader. > What this Max3222 really do? > > Any other BootLoader diagrams? > > Thanks. > Ramesh > --------------------------------- >

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Discussion Groups | Piclist | BootLoader for 16F872,16F877

BootLoader for 16F872,16F877 - R Ramesh - Jun 28 2:43:00 2004

Re: BootLoader for 16F872,16F877 - Phil - Jun 28 11:17:00 2004