AHB1 peripheral clock enable in low power mode register
| GPIOALPEN | IO port A clock enable during sleep mode |
| GPIOBLPEN | IO port B clock enable during Sleep mode |
| GPIOCLPEN | IO port C clock enable during Sleep mode |
| GPIOHLPEN | IO port H clock enable during Sleep mode |
| CRCLPEN | CRC clock enable during Sleep mode |
| FLITFLPEN | Flash interface clock enable during Sleep mode |
| SRAM1LPEN | SRAM 1interface clock enable during Sleep mode |
| DMA1LPEN | DMA1 clock enable during Sleep mode |
| DMA2LPEN | DMA2 clock enable during Sleep mode |
| RNGLPEN | RNG clock enable during sleep mode |