Difference between CALL and JUMP instructions



CALL instruction is used to call a subroutine. Subroutines are often used to perform tasks that need to be performed frequently. The JMP instruction is used to cause the PLC to skip over rungs.

The differences Between CALL and JUMP instructions are:

SERIAL NO. JUMP CALL
1. Program control is transferred to a memory location which is in the main program Program Control is transferred to a memory location which is not a part of main program
2. Immediate Addressing Mode Immediate Addressing Mode + Register Indirect Addressing Mode
3. Initialisation of SP(Stack Pointer) is not mandatory Initialisation of SP(Stack Pointer) is mandatory
4. Value of Program Counter(PC) is not transferred to stack Value of Program Counter(PC) is transferred to stack
5. After JUMP, there is no return instruction After CALL, there is a return instruction
6. Value of SP does not changes Value of SP is decremented by 2
7. 10 T states are required to execute this instruction 18 T states are required to execute this instruction
8. 3 Machine cycles are required to execute this instruction 5 Machine cycles are required to execute this instruction


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