Altera Nios II User Manual page 230

8–50
eret
Operation:
Assembler Syntax:
Example:
Description:
Usage:
Exceptions:
Instruction Type:
Instruction Fields:
31 30 29 28 27 26 25
0x1d 0x1e
Nios II Processor Reference Handbook
status ← estatus
PC ← ea
eret
eret
Copies the value of estatus into the status register, and transfers execution to the address in
ea.
Use eret to return from traps, external interrupts, and other exception handling routines. Note
that before returning from hardware interrupt exceptions, the exception handler must adjust the
ea register.
Misaligned destination address
Supervisor-only instruction
R
None
24 23 22 21 20 19 18 17
0
16 15 14 13 12 11 10 9
0x01
Chapter 8: Instruction Set Reference
Instruction Set Reference
exception return
8 7 6 5 4 3 2 1
0 0x3a
February 2014 Altera Corporation
0