Re: [Usbpicprog-technical] [usbpicprog-technical] boot loader and firmware

[Frans S. <fra...@gm...>]

Dear Virender Bangar,

The PIC18F2550 has a reserved space (address 0 to 0x7FF) for the
bootloader. This is the place where the bootloader is written the first
time. Once this bootloader is in the flash of the pic, it can connect to
usb and write the other code space (0x800 and beyond) for the actual
firmware. The bootloader can be selected through the jumper settings. If
you look at the firmware file, you will see (apart from some jump
instructions which are ignored by the bootloader) no instructions in the
area 0x000-0x7FF.

I hope this explains it.

Kind regards,

Frans Schreuder

On 08/23/2011 11:41 AM, virender bangar wrote:
> Name: virender bangar
>
> Email: vir...@ya...
>
> Subject: boot loader and firmware
>
> Message: Hello Sir
> I would like know that in 18f2550 weather we need to burn the boot
> loader or firmware.As you said that boot loader  has to be burnt once
> then if after that i will try to burn the firmware , the boot loader
> file will get replaced...
>
> please make the difference clear to me where to use boot loader and
> where to use firmware
>
>
>