For MSP430

A. (12 points) What does this program do? Add code comments (lines 1-19). B. (10 points) Sketch the content of the stack at the moment when the program executes the instruction at line 20. Assume that the original value of R1=04400 (initialized in line 1). ascii( (A)=041, ascii(' Z)=05A, ascii(0)=030. C. (3 points) Calculate the total execution time in seconds (time it takes for the program to reach statement in line 20). Assume the clock frequency is 1MHz and CPI=2.5. How many instructions are executed in this program (before reaching the statement at line 19 - do not count line 19 )