Для отображения регистров используйте окно Watch, в хэлпе на PICkit2 есть замечание на этот счет:
It is not recommended to use the View>File Registers and View>Special Function Registers windows when debugging with PICkit 2 Debug Express. When these windows are open, the entire contents must be written then read back from the target device on every operation. This may slow down debugging operations significantly. Instead, only add the SFR and File Register variables of interest to a Watch window as described in this tutorial.
Причина редактирования: Бездумное цитирование