This video works best if you have my textbook and are following along with the video. Get the book here: https://amzn.to/32vpsEY. This video covers section 10.2 in the textbook "Introduction to Embedded Systems Design using the MSP430FR2355" by Brock LaMeres. This section describes the operation of the subroutines on the MSP430. This video also has an example program where a subroutine is called multiple times and PC, SP, and the stack are observed to see how the starting address and return address are accessed.