RET = Return from routine
| Hex | Mnemonic | Cycles |
|---|---|---|
| F8 | RET | 16 |
| F9 | RETI | 16 |
| FA | RETSKIP | 16 |
Execute
F = Register F
U/V = Register U or V
SP = Register SP (Stack Pointer)
PC = Register PC (Program Counter)
; RET (Return from a subroutine)
V = Memory[SP+2]
PC = (Memory[SP+1] SHL 8) + Memory[SP]
SP = SP + 3
; RETI (Return from an interrupt)
V = Memory[SP+3]
PC = (Memory[SP+2] SHL 8) + Memory[SP+1]
F = Memory[SP]
SP = SP + 4
; RETSKIP (Return from a subroutine and skip 2 bytes)
V = Memory[SP+2]
PC = (Memory[SP+1] SHL 8) + Memory[SP] + 2
SP = SP + 3
Description
Return from a subroutine or an interrupt.
Conditions
None
Examples
; A = 0x10 ; B = 0x10 CALL somefunction ; A = 0x11 ; B = 0x0F (...) somefunction: INC A DEC B RET INC A ; Never executed