# Form `SC` — SC — System Call

## Bit Layout

| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (17) |
| 6–19 | `—` | reserved |
| 20–26 | `LEV` | exception level |
| 27–29 | `—` | reserved |
| 30 | `1` | fixed 1 |
| 31 | `—` | reserved |

## Instructions Using This Form

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| Mnemonic | Opcode | Group | Description |
| --- | --- | --- | --- |
| [`sc`](../branch/sc.md) | `0x44000002` | branch | System Call |

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