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RETI     Return from Subroutine     Rabbit 2000/3000/4000/5000 Instruction

Opcode	Instruction	Operation
ED 4D	RETI	IP = (SP) PClow = (SP+1) PChigh = (SP+2) SP = SP+3

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	12	n/a	n/a
Rabbit 5000	12	12	10

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

Description

Loads IP with the data whose address is on the top of the stack, which should be the interrupt priority that was saved when the interrupt occurred. Then, loads PC from the stack, which should be the return address that was saved when the interrupt occurred. Next, the interrupt priority and the return address are popped off the stack by adding 3 to SP.

This is a chained-atomic instruction, meaning that an interrupt cannot take place between this instruction and the instruction following it.