MicroBlaze Processor Reference Guide www.xilinx.com 131
UG081 (v6.0) June 1, 2006 1-800-255-7778
Return from Exception
Return from exception will branch to the location speciﬁed by the contents of rA plus the
IMM ﬁeld, sign-extended to 32 bits. The instruction will also enable exceptions after
This instruction always has a delay slot. The instruction following the RTED is always
executed before the branch target.
PC ← (rA) + sext(IMM)
allow following instruction to complete execution
MSR[EE] ← 1
MSR[EIP] ← 0
ESR ← 0
Convention is to use general purpose register r17 as rA. This instruction requires that one
or more of the MicroBlaze parameters C_*_EXCEPTION are set to 1.
A delay slot must not be used by the following: IMM, branch, or break instructions. This
also applies to instructions causing recoverable exceptions (e.g. unalignement), when
hardware exceptions are enabled. Interrupts and external hardware breaks are deferred
until after the delay slot branch has been completed.
rted rA, IMM
1 0 1 1 0 1 1 0 1 0 0 rA IMM
0 6 11 16 31