Show the value on top of the stack and value of the stack pointer for each line

Question

Show the value on top of the stack and value of the stack pointer for each line of the following program. It will be easier to use a table with three colomns listing instruction, value at the top of the stack, and value of the stack pointer. You can leave the unknown or non-updated value blank or use 'U'.

ORG     0H

MOV     R0,     #66H

MOV     R3,     #7FH

PUSH     0

PUSH     3

PUSH     7

CLR     A

MOV     R3,     A

MOV     R7,     A

POP     3

POP     7

POP     0

This is for a Microcontrollers Class using primarily the 8051 Model.

Explanation / Answer

Instruction Value at the top of the stack Value of the stack pointer ORG 0H U 0H MOV R0, #66H U 0H MOV R3, #7FH U 0H PUSH 0 U 1H PUSH 3 U 2H PUSH 7 U 3H CLR A U 3H MOV R3,A U 3H MOV R7,A U 3H POP 3 U 2H POP 7 U 1H POP 0 U 0H

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