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What will be content of Stack Pointer if following assembly code of 8051 microcontroller is executed immediately after reset? PUSH 00h POP 01h POP 02h

What will be content of Stack Pointer if following assembly code of 8051 microcontroller is executed immediately after reset? PUSH 00h POP 01h POP 02h Correct Answer 06h

PUSH –

Op code

Operand

Byte

M-cycle

T-state

PUSH

RP

1

3

12T


Push function is used to insert on dement at the top of the stock. The element is added to the stack container and size of the stack is increased by ‘1’

Pop

Op code

Operand

Byte

M-cycle

T-state

Pop

RP

1

3

10T

 

Pop instruction is used to delete an element from the top of the stack. The element is deleted to the stack container and size of the stack is decremented by ‘1’

8051 default stack pointer value SP = 07

PUSH 00h ⇒ SP = 07 + 1 = 08h

POP 01h ⇒ SP = 08 – 1 = 07h

POP 02h ⇒ SP = 07 – 1 = 06h

Option 2) correct choice.

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