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.