Communication device and tire pressure monitoring system

A tire pressure monitoring system comprising:

• a communication device including a normal operation mode and a low-power consumption mode, the communication device including a first memory unit, a second memory unit, and a control unit, the first memory unit including a work area for execution of firmware configured to perform basic control of the communication device, the second memory unit being configured to store software for communication with an external device, the control unit being configured to stop, when transition is performed from the normal operation mode to the low-power consumption mode, voltage supply to the first memory unit and perform control to reduce voltage supplied to the second memory unit to lower than voltage in the normal operation mode, the communication device being disposed inside a tire;
• a control device configured to receive an advertising packet transmitted at a predetermined interval from the communication device and including measurement results measured by a plurality of sensors, and determine whether the measurement results have anomaly;
• and
• a display unit configured to notify, when the control device determines that the measurement results have anomaly, a driver of the anomaly of the tire.