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Field CKMODE
writer - ADC clock mode
Use Kernel Clock adc_ker_ck_input divided by PRESC. Asynchronous to AHB clock
Use AHB clock rcc_hclk3. In this case rcc_hclk must equal sys_d1cpre_ck
Use AHB clock rcc_hclk3 divided by 2
Use AHB clock rcc_hclk3 divided by 4