CPU2 APB1ENR1
| TIM2EN | CPU2 TIM2 timer clock enable |
| LCDEN | CPU2 LCD clock enable |
| RTCAPBEN | CPU2 RTC APB clock enable |
| SPI2EN | CPU2 SPI2 clock enable |
| I2C1EN | CPU2 I2C1 clock enable |
| I2C3EN | CPU2 I2C3 clock enable |
| CRSEN | CPU2 CRS clock enable |
| USBEN | CPU2 USB clock enable |
| LPTIM1EN | CPU2 Low power timer 1 clock enable |