Reads a single unsigned integer of 16-bit size from the I2C device.

(new_state, new_t, data_out) = readUInt16(device, state, t, stage, register, data)

device	Type: Device
state	Type: State
t	Type: Transaction
stage	Type: Stage
register	Type: Integer
data	Type: Integer

new_state	Type: State
new_t	Type: Transaction
data_out	Type: Integer