Computer-Organization

An 8052 based system has an output port with address 00H. Consider the following assembly language program.

     ORG    0100H
     MVI    A, 00H
     LXI    H, 0105H
     OUT    00H
     INR    A
     PCHL
     HLT   

(a) What does the program do with respect to the output port 00H?
(b) Show the wave forms at the three least significant bits of the port 00H.