Control device for connecting a CAN bus to a radio network, and motor vehicle having such a control device

A control device for connecting a controller area network (CAN) bus to a radio network, comprising:

• a wireless controller, a microcontroller, a first CAN transceiver and a second CAN transceiver,
• the microcontroller is connected to the wireless controller and the CAN transceivers,
• the microcontroller and the second CAN transceiver have a serial peripheral interface, wherein the serial peripheral interface is configured for self-holding separation by an asynchronous level-controlled flip-flop,
• the microcontroller has a binary control output (out) which is connected to a set input (S) of the asynchronous level-controlled flip-flop, and the microcontroller controls the separation by the control output (out),
• the first CAN transceiver is connected to the second CAN transceiver,
• the first CAN transceiver is configured to (i) suppress transmission (Tx) via the CAN bus and support reception (Rx) via the CAN bus in a first mode in which CAN transmissions are suppressed, and (ii) support transmission (Tx) and reception (Rx) in a second mode in which CAN transmissions are enabled,
• the second CAN transceiver is configured to change the first CAN transceiver from the first mode to the second mode when the second CAN transceiver receives (Rx) a wake-up frame via the CAN bus,
• the microcontroller is programmed such that it initially configures the wake-up frame via the serial peripheral interface.