Interrupt Mask Register
| MOSCXTS | Main Crystal Oscillator Status Interrupt Mask |
| LOCKA | PLLA Lock Interrupt Mask |
| MCKRDY | Master Clock Ready Interrupt Mask |
| LOCKU | UTMI PLL Lock Interrupt Mask |
| PCKRDY0 | Programmable Clock Ready 0 Interrupt Mask |
| PCKRDY1 | Programmable Clock Ready 1 Interrupt Mask |
| PCKRDY2 | Programmable Clock Ready 2 Interrupt Mask |
| PCKRDY3 | Programmable Clock Ready 3 Interrupt Mask |
| PCKRDY4 | Programmable Clock Ready 4 Interrupt Mask |
| PCKRDY5 | Programmable Clock Ready 5 Interrupt Mask |
| PCKRDY6 | Programmable Clock Ready 6 Interrupt Mask |
| PCKRDY7 | Programmable Clock Ready 7 Interrupt Mask |
| MOSCSELS | Main Clock Source Oscillator Selection Status Interrupt Mask |
| MOSCRCS | Main RC Status Interrupt Mask |
| CFDEV | Clock Failure Detector Event Interrupt Mask |
| XT32KERR | 32.768 kHz Crystal Oscillator Error Interrupt Mask |