Hi,
Sorry for the delay. You can use the power_manager_lpc demo application as a reference.
SDK_2.6.0_LPCXpresso54114.zip\boards\lpcxpresso54114\demo_apps\power_manager_lpc\cm4
The power_manager_lpc application shows the usage of normal power mode control APIs for entering the three kinds of low power mode: Sleep mode, Deep Sleep mode and Sleep Power Down mode. When the application runs to each low power mode, the device would cut off the power for specific modules to save energy. The device can be also waken up by
prepared wakeup source from external event.
Attach you can find the API or you can find these files in the path: SDK_2.6.0_LPCXpresso54114.zip\devices\LPC54114\drivers
I hope this helps,
have a nice day!
Regards
Soledad