APB2 peripheral Low-power clock enable register (CRM_APB2LPEN)
| TMR1LPEN | Timer1 clock enable during sleep mode |
| USART1LPEN | USART1 clock enable during sleep mode |
| USART6LPEN | USART6 clock enable during sleep mode |
| ADCLPEN | ADC clock enable during sleep mode |
| SPI1LPEN | SPI1 clock enable during sleep mode |
| SCFGLPEN | SCFG clock enable during sleep mode |
| TMR9LPEN | Timer9 clock enable during sleep mode |
| TMR10LPEN | Timer10 clock enable during sleep mode |
| TMR11LPEN | Timer11 clock enable during sleep mode |
| ACCLPEN | ACC clock enable during sleep mode |