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PERIODIC ERROR DETECTION METHOD AND PERIODIC ERROR DETECTION CIRCUIT

  • US 20130111276A1
  • Filed: 03/13/2012
  • Published: 05/02/2013
  • Est. Priority Date: 10/28/2011
  • Status: Active Grant
First Claim
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1. A method for detecting a periodic error, the method detecting a periodic processing error of a module, execution of processing of the module being controlled by a processor, the processor controlling a periodic processing by booting a peripheral module, the peripheral module outputting periodic triggers with a predetermined interval, comprising:

  • storing a first count value in a resister included in a capture timer, the first count value being acquired from a counter included in the capture timer by outputting the periodic triggers as a first capture trigger into the capture timer, the counter performing an up-count operation with free-run;

    storing a second count value in the resister, the second count value being acquired from the counter by outputting a second capture trigger into the capture timer when the processing of the module is started;

    storing a third count value in the resister, the third count value being acquired from the counter by outputting a third capture trigger into the capture timer when the processing of the module is completed;

    reading out the first count value, the second count value and the third count value from the resister when the processor is received a complete notice from the module;

    calculating a processing time on a basis of the first count value, the second count value and the third count value; and

    comparing the processing time with the predetermined interval to determine whether the periodic processing error occurs.

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