Enter UV coordinates position How can I manually type in the coordinates for my UVs?

Currently I am seeing these buttons:



But these simply adjust according to mouse movements.

The reason for this is my model is simply 2 quads with their UVs overlaid. I would like to snap these UVs is certain tiles on my texture map - much like a tile map.

Perhaps there is a better way to do this than manually entering the coordinates?
In the UV editor press N to display the Information panel on the right.  At the top is the UV Vertex section where you can type the values directly.



Based on what you've said, it might also be useful to enable "Snap to Pixels" in the UVs menu.