A direct Tire Pressure Monitoring System, TPMS, for providing a non-continuous tire pressure monitoring of a tire of a vehicle, the TPMS comprising: a processing unit having at least a first operating mode and a second operating mode; a timing unit operably coupled to the processing unit; an acceleration measuring unit operably coupled to the timing unit; a comparing unit operably coupled to the processing unit and the acceleration measuring unit; a pressure measuring unit operably coupled to the processing unit; a transmitting unit operably coupled to the processing unit; and, a power supplying unit for supplying power to at least the processing unit in the first operating mode and in the second operating mode, wherein the second operating mode is less power consuming than the first operating mode, wherein when operating in the first operating mode, the processing unit is adapted to set an operating clock frequency of the timing unit; and, to set an acceleration threshold of the comparing unit; wherein the timing unit is adapted to activate the acceleration measuring unit at the rate of the operating clock frequency; wherein the acceleration measuring unit is adapted to measure an acceleration value associated with the tire in at least one direction; wherein the comparing unit is adapted to compare the acceleration value and the acceleration threshold and to generate a trigger signal when the absolute acceleration value is greater than the acceleration threshold, and to direct the trigger signal to the processing unit; wherein when operating in the first operating mode, the processing unit is further adapted to activate the pressure measuring unit responsive to the trigger signal; wherein the pressure measuring unit is adapted to measure a pressure value associated with the tire; wherein when operating in the first operating mode, the processing unit is further configured to generate a transmitting signal based on the pressure value; wherein the transmitting unit is adapted to transmit the transmitting signal; wherein the processing unit is adapted to enter the second operating mode after the acceleration threshold and the operating clock frequency have been set; and to enter the first operating mode in response to the trigger signal. a processing unit having at least a first operating mode and a second operating mode; a timing unit operably coupled to the processing unit; an acceleration measuring unit operably coupled to the timing unit; a comparing unit operably coupled to the processing unit and the acceleration measuring unit; a pressure measuring unit operably coupled to the processing unit; a transmitting unit operably coupled to the processing unit; and, a power supplying unit for supplying power to at least the processing unit in the first operating mode and in the second operating mode, wherein the second operating mode is less power consuming than the first operating mode, wherein when operating in the first operating mode, the processing unit is adapted to set an operating clock frequency of the timing unit; and, to set an acceleration threshold of the comparing unit; to set an operating clock frequency of the timing unit; and, to set an acceleration threshold of the comparing unit; wherein the timing unit is adapted to activate the acceleration measuring unit at the rate of the operating clock frequency; wherein the acceleration measuring unit is adapted to measure an acceleration value associated with the tire in at least one direction; wherein the comparing unit is adapted to compare the acceleration value and the acceleration threshold and to generate a trigger signal when the absolute acceleration value is greater than the acceleration threshold, and to direct the trigger signal to the processing unit; wherein when operating in the first operating mode, the processing unit is further adapted to activate the pressure measuring unit responsive to the trigger signal; wherein the pressure measuring unit is adapted to measure a pressure value associated with the tire; wherein when operating in the first operating mode, the processing unit is further configured to generate a transmitting signal based on the pressure value; wherein the transmitting unit is adapted to transmit the transmitting signal; wherein the processing unit is adapted to enter the second operating mode after the acceleration threshold and the operating clock frequency have been set; and to enter the first operating mode in response to the trigger signal. to enter the second operating mode after the acceleration threshold and the operating clock frequency have been set; and to enter the first operating mode in response to the trigger signal.