Arduino Ultrasonic Sensor Assembly Tutorial

Hi

Can anyone recommend a good place where I can learn to program the Ultrasonic Sensor for Arduino in Assembly Language? Most of the tutorials out there are mainly written in C.

Thanks.

Program the actual sensor board, or write a program that uses the output of a working sensor board?

If it's the former then I'm not aware of any ultrasonic sensor boards which are designed to have their firmware upgraded post manufacture. If they do exist then the knowledge is probably propriety or secret.