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IPRES     Interrupt Priority Reset     Rabbit 2000/3000/4000/5000 Instruction

Opcode	Instruction	Operation
ED 5D	IPRES	IP = {IP[1:0], IP[7:2]}

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	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

The IPRES instruction rotates the contents of IP 2 bits to the right, replacing the current priority with the previous priority.

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

Example

If IP contains 00000110, the execution of the instruction

IPRES

would cause IP to contain 10000001.