110 www.xilinx.com MicroBlaze Processor Reference Guide
1-800-255-7778 UG081 (v6.0) June 1, 2006
Chapter 4: MicroBlaze Instruction Set Architecture
Load Byte Unsigned Immediate
Loads a byte (8 bits) from the memory location that results from adding the contents of
register rA with the value in IMM, sign-extended to 32 bits. The data is placed in the least
signiﬁcant byte of register rD and the other three bytes in rD are cleared.
Addr ←(rA) + sext(IMM)
By default, Type BInstructionswill take the16-bit IMM ﬁeldvalue and sign extendit to 32
bits to use as the immediate operand. This behavior can be overridden by preceding the
Type B instruction with an imm instruction. See the imm instruction for details on using
32-bit immediate values.
lbui rD, rA, IMM
1 1 1 0 0 0 rD rA IMM
0 6 11 16 31