TSK3000A Core Instruction - LBU

Instruction:

Load Byte Unsigned

Assembler Format:

lbu rB, IMM16(rA)

Example:

lbu $3, 2($5)

Description:

Generates a 32-bit effective address by sign-extending the 16-bit immediate value, IMM16, and adding it to the contents of GPR rA. It then zero-extends the byte at the memory location pointed to by the effective address and loads the result into GPR rB.

Operation:

rB <-- ZeroExtend(Mem8[rA + SignExtend(IMM16)])

Instruction Type:

I-Type

Instruction Fields:

rA = Register index of operand A (base address)

rB = Register index of destination

IMM16 = 16-bit immediate data value