This source code supports Microchip Technology?s Application Note AN1229 describes the Class B Safety Software Library routines that detect the occurrence of Faults in a single channel CPU. These routines have been developed in accordance with the IEC 60730 standard to support the Class B certification process. These routines can be directly integrated with the end user?s application to test and verify the critical functionalities of a controller without affecting the end user?s application.AN1229 also describes the Application Programming Interface (API) functions that are available in the Class B Safety Software Library. The Class B safety software routines can be called periodically at start-up or run time to test the following components:? CPU Registers? CPU Program Counter? Invariable Memory? Variable Memory? Clock? Interrupt Handling and Execution