Arithmetic Micro-operations
In general, the Arithmetic Micro-operations deals with the operations performed on numeric data stored in the registers.
The basic Arithmetic Micro-operations are classified in the following categories:
- Addition
- Subtraction
- Increment
- Decrement
- Shift
Some additional Arithmetic Micro-operations are classified as:
- Add with carry
- Subtract with borrow
- Transfer/Load, etc.
The following table shows the symbolic representation of various Arithmetic Micro-operations.
| Symbolic Representation | Description |
|---|---|
| R3 ← R1 + R2 | The contents of R1 plus R2 are transferred to R3. |
| R3 ← R1 - R2 | The contents of R1 minus R2 are transferred to R3. |
| R2 ← R2' | Complement the contents of R2 (1's complement) |
| R2 ← R2' + 1 | 2's complement the contents of R2 (negate) |
| R3 ← R1 + R2' + 1 | R1 plus the 2's complement of R2 (subtraction) |
| R1 ← R1 + 1 | Increment the contents of R1 by one |
| R1 ← R1 - 1 | Decrement the contents of R1 by one |
