11.3.1.3 Read Synchronization

Reading a read-synchronized Peripheral Core register will cause the peripheral bus to stall immediately until the read synchronization is complete. STATUS.SYNCBUSY will not be set. Refer to Synchronization Delay for details on the synchronization delay. Note that reading a read-synchronized Peripheral Core register while STATUS.SYNCBUSY is one will cause the peripheral bus to stall twice; first because of the ongoing synchronization, and then again because reading a Read-synchronized Core register will cause the peripheral bus to stall immediately.