This register cannot be accessed (read/write) directly.
| Bit | Flag |
|---|---|
| 0 | CF Carry Flag |
| 1 | 1 |
| 2 | PF Parity Flag |
| 3 | 0 |
| 4 | AF Auxiliary Flag |
| 5 | 0 |
| 6 | ZF Zero Flag |
| 7 | SF Sign Flag |
| 8 | TF Trap Flag (Single Step) |
| 9 | IF Interrupt Flag |
| 10 | DF Direction Flag |
| 11 | OF Overflow flag |
| 12 | IOPL I/O Privilege Level (286+ only) |
| 13 | NT Nested Task Flag (286+ only) |
| 14 | 0 |
| 15 | RF Resume Flag (386+ only) |
| 16 | VM Virtual Mode Flag (386+ only) |