PM_Opc_RET

== 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

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