Clock Line Frequency Test

Test Name: Clock line frequency test

Acceptable Measure (Annex. H): Time-slot monitoring of the program sequence (H.2.18.10.4)

Purpose of test: Detect unexpected deviations in system clock frequency

Description: This diagnostic test checks the stability and reliability oscillation at the expected clock frequency. This test uses the AC line frequency to verify proper CPU clock operation.

The AC line frequency is measured by using a zero-cross-detection circuit that is connected to the input of the Timer1 Gate Module.

API Documentation: Clock Line Frequency Diagnostic Test