TSK3000A Core Instruction - SB

Instruction:

Store Byte

Assembler Format:

sb rB, IMM16(rA)

Example:

sb $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 stores the least significant byte of register rB at the resulting effective address.

Operation:

Mem8[rA + SignExtend(IMM16)] <-- rB _7..0

Instruction Type:

I-Type

Instruction Fields:

rA = Register index of operand A

rB = Register index of operand B

IMM16 = 16-bit immediate data value