SPRZ491D december 2020 – june 2023 DRA821U , DRA821U-Q1
DCC: Incorrect clock selection
An incorrect clock hookup on the MCU DCC means that the HFOSC1 clock cannot be selected for comparison. The primary purpose of the DCC on MCU island (run off of HFOSC0) is to compare with the independent clock source provided by HFOSC1.
Other clock sources for comparison are available (including the internal oscillator) with less accuracy. More attention should be paid to external watchdog mechanisms as well in order to indirectly check that clocks are working as expected by checking for loss of availability.