Debug MCU APB1 freeze register1
| DBG_TIM2_STOP | TIM2 counter stopped when core is halted  |  
| DBG_TIM3_STOP | TIM3 counter stopped when core is halted  |  
| DBG_TIM4_STOP | TIM4 counter stopped when core is halted  |  
| DBG_TIM5_STOP | TIM5 counter stopped when core is halted  |  
| DBG_TIM6_STOP | TIM6 counter stopped when core is halted  |  
| DBG_TIM7_STOP | TIM7 counter stopped when core is halted  |  
| DBG_RTC_STOP | Debug RTC stopped when core is halted  |  
| DBG_WWDG_STOP | Debug window watchdog stopped when core is halted  |  
| DBG_IWDG_STOP | Debug independent watchdog stopped when core is halted  |  
| DBG_I2C1_SMBUS_TIMEOUT | SMBUS timeout mode stopped when core is halted  |  
| DBG_I2C2_SMBUS_TIMEOUT | SMBUS timeout mode stopped when core is halted  |