I2C2SEL=B_0x0, I3C2SEL=B_0x0, USBFSSEL=B_0x0, SYSTICKSEL=B_0x0, I2C1SEL=B_0x0, I3C1SEL=B_0x0
RCC kernel clock configuration register
| SYSTICKSEL | SYSTICK clock source selection Note: rcc_hclk frequency must be four times higher than lsi_ker_ck/lse_ck (period (LSI/LSE) greater than or equal 4 * period (HCLK). 0 (B_0x0): rcc_hclk/8 selected as clock source (default after reset) 1 (B_0x1): lsi_ker_ck[1] selected as clock source 2 (B_0x2): lse_ck[1] selected as clock source 3 (B_0x3): reserved, the kernel clock is disabled |
| USBFSSEL | USBFS kernel clock source selection 0 (B_0x0): no clock is selected as kernel clock (default after reset) 1 (B_0x1): pll1_q_ck selected as kernel clock 2 (B_0x2): pll2_q_ck selected as kernel clock 3 (B_0x3): hsi48_ker_ck selected as kernel clock |
| I2C1SEL | I2C1 kernel clock source selection 0 (B_0x0): rcc_pclk1 selected as kernel clock (default after reset) 1 (B_0x1): pll2_r_ck selected as kernel clock 2 (B_0x2): hsi_ker_ck selected as kernel clock 3 (B_0x3): csi_ker_ck selected as kernel clock |
| I2C2SEL | I2C2 kernel clock source selection 0 (B_0x0): rcc_pclk1 selected as kernel clock (default after reset) 1 (B_0x1): pll2_r_ck selected as kernel clock 2 (B_0x2): hsi_ker_ck selected as kernel clock 3 (B_0x3): csi_ker_ck selected as kernel clock |
| I3C1SEL | I3C1 kernel clock source selection 0 (B_0x0): rcc_pclk3 selected as kernel clock (default after reset) 1 (B_0x1): pll2_r_ck selected as kernel clock 2 (B_0x2): hsi_ker_ck selected as kernel clock 3 (B_0x3): no clock selected |
| I3C2SEL | I3C2 kernel clock source selection 0 (B_0x0): rcc_pclk3 selected as kernel clock (default after reset) 1 (B_0x1): pll2_r_ck selected as kernel clock 2 (B_0x2): hsi_ker_ck selected as kernel clock 3 (B_0x3): no clock selected |