A transceiver includes a transmit pin configured to receive a signal from a microcontroller, a receive pin configured to transmit a signal to a microcontroller and a bus pin configured to transmit and receive signalling to/from a network. The transceiver also includes a wake-up detector for selectively waking up the microcontroller connected to the transceiver, and one or more switches operable to put the transceiver in a first mode of operation. In the first mode of operation, the transmit pin is connected to the wake-up detector, and the wake-up detector is configured to activate a wake-up code in accordance with a signal received at the transmit pin.