TFTP is a simple file transfer protocol using UDP as its transport protocol. This protocol was designed to be small and easy to implement, so it lacks most of the features of a regular FTP. The only thing it can do is read and write files from and to a remote host.
µC/TFTPc is an add-on product to µC/TCP-IP that implements the client part of the TFTP protocol. µC/TFTPc implements the following RFC:
RFC 1350 ftp://ftp.rfc-editor.org/in-notes/rfc1350.txt
This document describes how to configure and use the µC/TFTPc module on top of µC/TCP-IP and µC/FS in a µC/OS-II environment.