TSK3000A Core Instruction - LBU

Frozen Content

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

Encoding:

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 0 1 0 0
rA
rB
IMM16

Latency: 1

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