APB Low Freeze Register
| DBG_TIMER2_STOP | Debug Timer 2 stopped when Core is halted |
| DBG_TIMER3_STOP | Debug Timer 3 stopped when Core is halted |
| DBG_TIMER6_STOP | Debug Timer 6 stopped when Core is halted |
| DBG_TIMER14_STOP | Debug Timer 14 stopped when Core is halted |
| DBG_RTC_STOP | Debug RTC stopped when Core is halted |
| DBG_WWDG_STOP | Debug Window Wachdog stopped when Core is halted |
| DBG_IWDG_STOP | Debug Independent Wachdog stopped when Core is halted |
| I2C1_SMBUS_TIMEOUT | SMBUS timeout mode stopped when Core is halted |