APB peripheral clock enable in Sleep mode register 2
| SYSCFGSMEN | SYSCFG, COMP and VREFBUF clock enable during Sleep mode |
| TIM1SMEN | TIM1 timer clock enable during Sleep mode |
| SPI1SMEN | SPI1 clock enable during Sleep mode |
| USART1SMEN | USART1 clock enable during Sleep mode |
| TIM14SMEN | TIM14 timer clock enable during Sleep mode |
| TIM15SMEN | TIM15 timer clock enable during Sleep mode |
| TIM16SMEN | TIM16 timer clock enable during Sleep mode |
| TIM17SMEN | TIM16 timer clock enable during Sleep mode |
| ADCSMEN | ADC clock enable during Sleep mode |