BootLoader for 16F872,16F877

Started by R Ramesh June 28, 2004
Hi all,
 
Here I m trying to make an Bootloader for 16F877 and 16F872.
 
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



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 > ---------------------------------
>