Method and device for conditioning the clock signal for a clock-controlled circuit arrangement

摘要

In order to increase the noise immunity and the reliability in the operation of clock-controlled circuit arrangements in a method for conditioning the clock signal for a clock-controlled circuit arrangement, particularly for microcomputers, in which a clock signal is generated which has a predetermined duty ratio and a predetermined clock frequency and is supplied to the clock-controlled circuit arrangement, the duty ratio generated and/or the clock frequency are checked for deviations from predetermined values and when the duty ratio and/or the clock frequency deviate from the predetermined values, the duty ratio and/or the clock frequency is changed and when predetermined deviations of the duty ratio and/or of the clock frequency exist, an output signal is generated which arrests the clock-controlled circuit arrangement in a predetermined state or controls an emergency operating function.