12.3.2 Reading Lock State

Reading the state of the peripheral lock is to be avoided as it greatly compromises the protection initially provided by the PAC. If a lock/unlock is implemented conditionally, there is a risk that eventual errors are not caught in the protection scheme. Examples indicating the issue are shown in Figure 12-6.

In the left figure above, one can see the runaway code continues as all illegal operations are conditional. On the right side figure, the runaway code is caught as it tries to unlock the peripheral.