APB1 peripheral clock enable register (CRM_APB1EN)
| TMR3EN | Timer3 clock enable |
| TMR6EN | Timer6 clock enable |
| TMR14EN | Timer14 clock enable |
| WWDTEN | Window watchdog timer clock enable |
| SPI2EN | SPI2 clock enable |
| USART2EN | USART2 clock enable |
| I2C1EN | I2C1 clock enable |
| I2C2EN | I2C2 clock enable |
| PWCEN | Power clock enable |