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SURES     System/User Register Reset     Rabbit 3000A/4000/5000 Instruction

Opcode	Instruction	Operation
ED 7D	SURES	SU = {SU[1:0],SU[7:2]}

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 3000A/4000	4	n/a	n/a
Rabbit 5000	4	4	2

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

Description

"Pops" the current mode off the SU register, returning the processor mode to the previous mode by rotating SU two bits to the right.

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