| Carry flag | |
|---|---|
| Case | Description |
| 1 + F = 0 | Carry Flag=1. Value carried to digit left of the buffer. |
| Signed flag | |
|---|---|
| Case | Description |
| F = 1111 | Signed Flag=1. Left most bit is one |
| a = 1010 | Signed Flag=1. Left most bit is one |
| 8 = 1000 | Signed Flag=1. Left most bit is one |
| 7 = 0111 | Signed Flag=0. Left most bit is zero |
| 3 = 0011 | Signed Flag=0. Left most bit is zero |
| Overflow flag | |
|---|---|
| Case | Description |
| A + A = 4 | Overflow Flag=1. Two signed values added gave a unsiged value. |
| 7 + 3 = a | Overflow Flag=1. Two unsigned values added gave a signed value. |
| Zero flag | |
|---|---|
| Case | Description |
| 1 - 1 = 0 | Zero Flag=1. Total equals 0. |
| a + -a = 0 | Zero Flag=1. Total equals 0. |
| Direction flag | |
|---|---|
| Case | Description |
| Parity flag | |
|---|---|
| Case | Description |