| Data Movement Instructions: | |||
| Assembly Language Instruction: | Example: | Meaning: | Machine Language Instruction: |
|
LOAD [REG] [MEM] STORE [MEM] [REG] MOVE [REG1] [REG2] |
LOAD R2 13 STORE 8 R3 MOVE R2 R0 |
R2 = M[13] M[8] = R3 R2 = R0 |
1000 0000 00 RR MMMM 0100 0000 00 MMMM RR 1100 0000 00 00RR RR |
| Arithmetic and Logic Instructions: | |||
| Instruction: | Example: | Meaning: | Opcode: |
|
ADD [REG1] [REG2] [REG3] SUB [REG1] [REG2] [REG3] AND [REG1] [REG2] [REG3] OR [REG1] [REG2] [REG3] |
ADD R3 R2 R1 SUB R3 R1 R0 AND R0 R3 R1 OR R2 R2 R3 |
R3 = R2 + R1 R3 = R1 - R0 R0 = R3 & R1 R2 = R2 | R3 |
0000 1000 00 RR RR RR 0000 0100 00 RR RR RR 0000 1100 00 RR RR RR 0000 0010 00 RR RR RR |
| Branching Instructions: | |||
| Instruction: | Example: | Meaning: | Opcode: |
|
BRANCH [MEM] BZERO [MEM] BNEG [MEM] |
BRANCH 10 BZERO 2 BNEG 7 |
PC = 10 PC = 2 IF ALU RESULT IS ZERO PC = 7 IF ALU RESULT IS NEGATIVE |
0000 0000 10 00 MMMM 0000 0000 01 00 MMMM 0000 0000 11 00 MMMM |
| Other Instructions: | |||
| Instruction: | Example: | Meaning: | Opcode: |
|
NOP HALT |
NOP HALT |
Do nothing. Halt the machine. |
0000 0000 0000 0000 1111 1111 1111 1111 |