SB

Store Byte

SB rs2, offset(rs1)

Stores the lowest 8 bits of a register to memory.

Details

SB stores the least-significant byte of rs2 to memory at address rs1+sext(offset).

Pseudocode Operation

M[R[rs1] + sext(offset)][7:0] = R[rs2][7:0];

Example

SB x5, 0(x10)

Encoding

Binary Layout

imm[11:5]

31:25

rs2

24:20

rs1

19:15

000

14:12

imm[4:0]

11:7

0100011

6:0

Format S-Type

Opcode 0x23

Extension RV32I

Operands

rs2
Source
rs1
Base Address
offset
Offset