Samsung Galaxy NX500 Camera User Manual (en)

My Camera > 
Shooting modes
 Program mode
The camera automatically adjusts shutter speed and aperture value so that 
an optimal exposure value can be achieved.
This mode is useful when you want to capture shots of constant exposure 
while being able to adjust other settings.
Rotate the mode dial to P.
Set the desired options.
Half-press [Shutter] to focus, and then press [Shutter] to 
capture the photo.