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Clock fail detection for Stellaris LM3SX00 MCUs

Posted: 28 Jan 2011     Print Version  Bookmark and Share

Keywords:Stellaris  LM3SX00  clock failure 

The Stellaris on-chip clock failure detection circuitry allows a microcontroller to respond appropriately if the main crystal oscillator stops functioning. This capability can be extended to situations in which the crystal oscillator fails due to an open or short circuit.

The clock fail detection logic on the Stellaris LM3SX00 microcontrollers detects clocking failures of the main crystal oscillator circuit on the PCB and automatically switches to the internal crystal oscillator circuit as the clock source. In addition to situations in which the crystal oscillator stops operating correctly, the crystal oscillator could fail due to an open or short circuit. The clock fail detection logic is designed to detect failures of the first type. With a minor modification to the crystal clock circuit, the detection logic can also detect failures of the second type. This application note discusses the hardware modification required for the second type of failure as well as the code required to properly use the clock fail detection feature.

View the PDF document for more information.





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