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Question 3. a) Explain the difference between a Macro and a Subroutine. b) Consider the AVR assembly given in Listing 3-1. i. All instructions in the program are 2 bytes long. What is the size of the code in bytes? ii. Explain the function of the symbols @0' and '@l' in the co iii. Determine the maximum delay this code can generate. Sho all your workings. Assume the processor is operating at 16 MHz iv. Given sample code showing how this macro could be called AVR assembly code. v. Write a subroutine that could achieve the same delay as thi macro. Give sample code showing how this subroutine coul be called vi. Discuss how longer delays could be achieved using the subroutine you wrote in part (v). Listing 3-1 nop .MACRO delay ldi @o,@1 loop: nop nop nop dec @o brne loop ENDMACRO