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JUMP RET CALL RETI RETN RETF These are unconditional branch instructions By, Satish G.Patil
instruction register
There is no exit instruction in the 8085. Do you mean return, as in from a function or interrupt? If so, the instruction is RET.
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Both are used for Return operations. But the difference is IRET uses extra 2 bytes along with 2 bytes(making it 4 bytes) for poping from stack. And RET uses only 2 byte of instruction for Poping. IRET is used to switch from Virtual Mode to Protected Mode whereas RET isn't.
RET pops the PC off of the stack, while IRET pops both the flags and the PC off of the stack.
RET instruction needs 3 machine cycles. One to fetch and decode the instruction(4 T states), and two more machine cycles(i.e. 2*3=6 T states) to read two bytes from the stack(stack is exterior to microprocessor, stack is in R/W memory, so to exchange data with stack needs machine cycles). Thus, RET instruction needs total 3 machine cycles and 10 T-states.
ret or Ret or RET for abbreviated retired