Writes a single byte to the specified register. When writting to some I2C devices, it is not necessary to provide the register value. In such case, provide the input register value of 0.

(new_state, new_t) = writeByte(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