APB2 peripheral clock enable register (CRM_APB2EN)
| TMR1EN | Timer1 clock enable |
| TMR8EN | Timer8 clock enable |
| USART1EN | USART1 clock enable |
| USART6EN | USART6 clock enable |
| ADC1EN | ADC1 clock enable |
| ADC2EN | ADC2 clock enable |
| ADC3EN | ADC3 clock enable |
| SPI1EN | SPI1 clock enable |
| SPI4EN | SPI4 clock enable |
| SCFGEN | SCFG clock enable |
| TMR9EN | Timer9 clock enable |
| TMR10EN | Timer10 clock enable |
| TMR11EN | Timer11 clock enable |
| TMR20EN | Timer20 clock enable |
| ACCEN | ACC clock enable |