LOCK=B_0x0
EXTI lock register
LOCK | Global security and privilege configuration registers (EXTI_SECCFGR and EXTI_PRIVCFGR) lock This bit is written once after reset. 0 (B_0x0): Security and privilege configuration open, can be modified. 1 (B_0x1): Security and privilege configuration locked, can no longer be modified. |