Hello. Short answer is not really, there's no cron or job scheduler available. That's typically accomplished with an external management system. A very crude way to do it would be to "copy run tftp ..." and then "repeat" that command. But that would only work while the session is running (console, telnet, ssh) and would overwrite that file every time.
Best way would be to use an external management system or write a simple script to do it.
