SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
The reference clock MCU_PLL0_REF_CLK for the PLL in MCU domain is chosen between the internal high-frequency (HF) oscillator with external crystal (MCU_HFOSC0) and 12.5-MHz free-running RC oscillator. The selection is made through CTRLMMR_MCU_PLL_CLKSEL[8] CLKLOSS_SWTCH_EN, see Table 5-985.
CTRLMMR_MCU_PLL_CLKSEL(1)[8] CLKLOSS_SWTCH_EN | MCU_PLL0_REF_CLK |
---|---|
0 (default) | MCU_HFOSC0_CLK |
1 | MCU_CLK_12M_RC if clock loss is detected or MCU_HFOSC0_CLK if clock loss is not detected |