Question

Explain the function of the following registers in 8085 MPU:

1) Stack Pointer

2) Instruction Register

3) Program Counter​

Answer 1

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1. Stack Pointer : It is used as a memory pointer. It points to a memory location in read/write memory, called the stack. It is always incremented/decremented by 2 during push and pop operation.
2. Instruction Register : These registers are used to store or copy temporary data, by using instructions, during the execution of the program
3. Program Counter : The function of the program counter is to point to the memory address from which the next byte is to be fetched.