One or more Dual Clock Comparators (DCCs) are implemented as multipurpose safety diagnostics. The DCC can be used to detect incorrect frequencies and drift between clock sources. The DCC is composed of two counter blocks: one is used as a reference timebase and a second is used for the clock under test. Both reference clock and clock under test may be selected via software, as can the expected ratio of clock frequencies. Deviation from the expected ratio generates an error indication to the ESM. For more information on the clock selection options implemented, see the device-specific data sheet. For DCC programming details, see the TRM.