## What is the opcode for SW?

101011
Store Instructions

Instruction Opcode/Function Syntax
sb 101000 o \$t, i (\$s)
sh 101001 o \$t, i (\$s)
sw 101011 o \$t, i (\$s)

## What is the opcode for addi?

The MIPS Greensheet specifies the addi instruction as an I-format instruction and the op- code/function for the addi as 8 (note that there is no function for an I-format instruction). This means the 6 bits for the op code are 001000.

What are 32-bit MIPS instruction formats?

MIPS has 32 registers, numbered from 0 to 31, each with 32 bits. To identify a register in MIPS we thus need 5 bits (25=32). MIPS instructions are encoded in binary, as 32-bit instruction words, called machine code. The layout of an instruction is called the instruction format.

Where is opcode stored?

Paper tape, mag tape, floppy disk, and hard disk are some of the external storage medium that the opcodes are stored on. etc. They’re loaded into the computer’s memory.

### How do you find the opcode?

Solution: It can be approached as:

1. As the processor has 40 instructions, number of bits for opcode = 6 (2^6 = 64)
2. As the processor has 24 register, number of bits for one register = 5 (2^5 = 32)
3. Total bits occupied by 2 registers and opcode = 6 + 5 + 5 =16.

### How many MIPS opcodes are there?

There are 32, 32-bit general purpose registers. – The value of register R0 is always zero.

How do I find the opcode and operand?

The opcode is the instruction that is executed by the CPU and the operand is the data or memory location used to execute that instruction….Opcodes and operands.

Assembly language opcode mnemonics and instructions Meaning/use
STA (Store) Transfers a number from the accumulator to RAM