Method for monitoring the time basis of a data processing unit and data processing unit

摘要

The method involves generating an electric oscillation by an oscillating crystal and generating a clock signal from the oscillation. A task (9) is called cyclically in a gap of time duration (T1) for checking an accuracy of the clock signal, and a counted measurand is changed. An operation is used on the counted measurand in another task (10), which is called cyclically in a gap of another time duration (T2). A result of the operation is compared with a predetermined threshold, and an action is activated with a deviation of the result from the threshold. An independent claim is included for a data processing unit with devices for monitoring a time base.