Can the output of a TCXO drive a LPC1114 uC?
Since the 100 pF series cap between the TCXO and the uC input pin is in series with the (presumably) high-impedance input pin of the uC, that by itself does not violate the 15 pF output load limit of the TCXO.
However if you try to make a capacitive divider to limit the uC input voltage to 1.8 V, you should calculate the equivalent capacitance of the two capacitors in series and compare that with the 15 pF limit.
If you have a few extra pennies and enough board space, consider just finding a 1.8 V buffer with 3.3-V tolerant inputs and put that between your TCXO and the uC (for example 74AUC1G07 74AUC1G04).