Set peripheral bits to 1 to mark as secure access only.
| DCDC | DCDC Secure Access |
| PDM | PDM Secure Access |
| RFSENSE | RFSENSE Secure Access |
| RADIOAES | RADIOAES Secure Access |
| SMU | SMU Secure Access |
| SMUCFGNS | SMUCFGNS Secure Access |
| RTCC | RTCC Secure Access |
| LETIMER0 | LETIMER0 Secure Access |
| IADC0 | IADC0 Secure Access |
| I2C0 | I2C0 Secure Access |
| WDOG0 | WDOG0 Secure Access |
| AMUXCP0 | AMUXCP0 Secure Access |
| EUART0 | EUART0 Secure Access |
| CRYPTOACC | CRYPTOACC Secure Access |
| AHBRADIO | AHBRADIO Secure Access |