ST STM32F446 Series

RM0390 Rev 4 171/1328
RM0390 Reset and clock control (RCC)
175
Bits 25:24 Reserved, must be kept at reset value.
Bits 23:22
FMPI2C1SEL[1:0]: I2C4 kernel clock source selection
00: APB clock selected as FMPI2C1 clock
01: System clock selected as FMPI2C1 clock
10: HSI clock selected as FMPI2C1 clock
11: APB clock selected as FMPI2C1 clock (same as “00”)
Bits 21:0 Reserved, must be kept at reset value.