Writing a value to this field sets the oscillator delay. A small
                    value will produce a fast clock and a large value will produce a slow clock.
                    Writing to this field will cause the tuner to start tuning from the written
                    value. Reading this value will return the last written delay or the oscillator
                    delay when a synchronization was requested from the DFLLULPRREQ register.
                    Writing a value to this register while a write synchronization or a read request
                    synchronization is on-going will have no effect and produce a PAC error.