| UMBC | CMSC 391 -- Programming Microcontrollers |
| Bit | Symbol | IP Bit Function |
|---|---|---|
| 7 | -- | Not implemented |
| 6 | -- | Not implemented |
| 5 | PT2 | Reserved for future use. |
| 4 | PS | Priority of serial port interrupt. Set/cleared by program. |
| 3 | PT1 | Priority of timer 1 overflow interrupt. Set/cleared by program. |
| 2 | PX1 | Priority of external interrupt 1. Set/cleared by program. |
| 1 | PT0 | Priority of timer 0 overflow interrupt. Set/cleared by program. |
| 0 | PX0 | Priority of external interrupt 0. Set/cleared by program. |
IE is bit addressable.
Direct Byte Address is 0B8h.