Hi All,

Just wanted to know, if someone would be good enough to tell me, roughly how much free program memory space is left on a chip like the pic18F4550 after it is programmed with all the coding for a USB to PC link ?

My other consideration is the chip needs to be a DIL package

Trying to work out if its better to do it all, usb and my program code proper in one chip, or to fit an extra little board like a UBW.

thanks

Richard

 

What are you asking?

The amound of disk space after it's been formated depends on the file-system, i.e. whether it's formatted with FAT32, ntfs or ext3.

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Hero999 I think you misunderstood the question.
I think he wants to know how much memory is used by the Microchip usb stack in a pic 18f4550.

It uses about 2-4 Kb depending on what usb options are needed (eg. 2k for a minimal usb bootloader or 3K for HID class firmware.)
see:
http://www.microchip.com/stellent/id...param=en022627

Should leave plenty of space for your own program on a 18f4450 which has 32K total available ( 16K of actual instructions)