A display device, having a microcontroller, a graphics controller, and a pointer driven by a stepper motor. The graphics controller does not have an arithmetic logic unit and can be controlled by the microcontroller and by command sequences of a command sequencer contained in the graphics controller. The graphics controller has a stepper motor controller and the command sequencer has a watchdog timer. The watchdog timer is designed to monitor a connection signal between the microcontroller and the graphics controller and to start a first command sequence if the connection signal is overdue. The first command sequence is designed to use an internal cyclical signal to repeatedly start a second command sequence designed to move the stepper motor one step in the direction of a stop or a home position by the stepper motor controller.


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    Title :

    Display device having a stepper motor and a watchdog timer


    Contributors:

    Publication date :

    2015-09-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G08B SIGNALLING OR CALLING SYSTEMS , Signalisier- oder Rufsysteme / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern



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