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LRET     Long Return     Rabbit 2000/3000/4000/5000 Instruction

Opcode	Instruction	Operation
ED 45	LRET	PClow = (SP) PChigh = (SP + 1) XPC = (SP + 2) SP = SP + 3

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	13	n/a	n/a
Rabbit 5000	13	11	11

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
-	-	-	-

Description

The LRET instruction is used to return from an LCALL operation. It transfers execution from a subroutine to the calling program by popping PC and the XPC from the stack.

First, the low-order byte of PC is loaded with the data whose address is SP. Next, the high-order byte of PC is loaded with the data whose address is SP+1. Then, XPC is loaded with the data whose address is SP+2. Finally the value in SP is incremented by 3.