Reset and clock control (RCC) RM0351
244/1693 DocID024597 Rev 3
Bits 23:22 SAI1SEL[1:0]: SAI1 clock source selection
These bits are set and cleared by software to select the SAI1 clock source.
00: PLLSAI1 “P” clock (PLLSAI1CLK) selected as SAI1 clock
01: PLLSAI2 “P” clock (PLLSAI2CLK) selected as SAI1 clock
10: PLL “P” clock (PLLSAI3CLK) selected as SAI1 clock
11: External input SAI1_EXTCLK selected as SAI1 clock
Caution: If the selected clock is the external clock, it is not possible to switch to another
clock if the external clock is not present.
Bits 21:20 LPTIM2SEL[1:0]: Low power timer 2 clock source selection
These bits are set and cleared by software to select the LPTIM2 clock source.
00: PCLK selected as LPTIM2 clock
01: LSI clock selected as LPTIM2 clock
10: HSI16 clock selected as LPTIM2 clock
11: LSE clock selected as LPTIM2 clock
Bits 19:18 LPTIM1SEL[1:0]: Low power timer 1 clock source selection
These bits are set and cleared by software to select the LPTIM1 clock source.
00: PCLK selected as LPTIM1 clock
01: LSI clock selected as LPTIM1 clock
10: HSI16 clock selected as LPTIM1 clock
11: LSE clock selected as LPTIM1 clock
Bits 17:16 I2C3SEL[1:0]: I2C3 clock source selection
These bits are set and cleared by software to select the I2C3 clock source.
00: PCLK selected as I2C3 clock
01: System clock (SYSCLK) selected as I2C3 clock
10: HSI16 clock selected as I2C3 clock
11: reserved
Bits 15:13 I2C2SEL[1:0]: I2C2 clock source selection
These bits are set and cleared by software to select the I2C2 clock source.
00: PCLK selected as I2C2 clock
01: System clock (SYSCLK) selected as I2C2 clock
10: HSI16 clock selected as I2C2 clock
11: reserved
Bits 13:12 I2C1SEL[1:0]: I2C1 clock source selection
These bits are set and cleared by software to select the I2C1 clock source.
00: PCLK selected as I2C1 clock
01: System clock (SYSCLK) selected as I2C1 clock
10: HSI16 clock selected as I2C1 clock
11: reserved
Bits 11:10 LPUART1SEL[1:0]: LPUART1 clock source selection
These bits are set and cleared by software to select the LPUART1 clock source.
00: PCLK selected as LPUART1 clock
01: System clock (SYSCLK) selected as LPUART1 clock
10: HSI16 clock selected as LPUART1 clock
11: LSE clock selected as LPUART1 clock
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