pub type KEY_R = FieldReader<u32, u32>;Expand description
Field KEY reader - If the value of the KEY field is non-zero, and the KEY fields match on both the CPU and debugger sides, disable APPROTECT and enable debug access to non-secure mode until the next pin reset, brown-out reset, power-on reset, or watchog timer reset. After reset the debugger side register has a fixed KEY value. To enable debug access, both CTRL-AP and UICR.APPROTECT protection needs to be disabled.