Register Write Protection

To prevent any single software error from corrupting SYSC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the ”System Controller Write Protection Mode Register” (SYSC_WPMR).

The following registers can be write-protected:

• RSTC Mode Register⁽¹⁾
• RTT Mode Register⁽²⁾
• RTT Alarm Register⁽²⁾
• RTC Control Register⁽³⁾
• RTC Mode Register⁽³⁾
• RTC Time Alarm Register⁽³⁾
• RTC Calendar Alarm Register⁽³⁾
• General Purpose Backup Registers⁽⁴⁾
• Supply Controller Control Register
• Supply Controller Supply Monitor Mode Register
• Supply Controller Mode Register
• Supply Controller Wakeup Mode Register
• Supply Controller Wakeup Inputs Register