Question

(b) Illustrate POP CX if it is the subsequent instruction that accessed the Stack memory.

Answer 1

Pop is an operation of stack represent LIFO order to access data. Remove data from top of stack .pop get 16 bit value from the stack.

8086 CPU has 8general purposes register each register has its own name

Syntax of pop

pop REG

pop SREG

pop MEMORY

REG: AX,BX,CX,DX,DI,SI,BP,SP.

SREG:DS,ES,SS

MEMORY:[BX],[BX+s[+7]

CX ----->it is the counter register divided into two part(CH/CL) inside the CPU.

POP CX illustrate data store and retrieve respectively the contents of internal counter register.The store data and retrieve data must be in sequence duto LIFO order inside CPU.

All the instructions access from CPU by help of pop CX register.