STMicroelectronics STM32F05 series Reference Manual page 730

Debug support (DBG)
Bit 9 Reserved, must be kept at reset value.
Bit 8 DBG_TIM14_STOP: TIM14 counter stopped when core is halted
0: The counter clock of TIM14 is fed even if the core is halted
1: The counter clock of TIM14 is stopped when the core is halted
Bits 7:5 Reserved, must be kept at reset value.
Bit 4 DBG_TIM6_STOP: TIM6 counter stopped when core is halted
0: The counter clock of TIM6 is fed even if the core is halted
1: The counter clock of TIM6 is stopped when the core is halted
Bits 3:2 Reserved, must be kept at reset value.
Bit 1 DBG_TIM3_STOP: TIM3 counter stopped when core is halted
0: The counter clock of TIM3 is fed even if the core is halted
1: The counter clock of TIM3 is stopped when the core is halted
Bit 0 DBG_TIM2_STOP: TIM2 counter stopped when core is halted
0: The counter clock of TIM2 is fed even if the core is halted
1: The counter clock of TIM2 is stopped when the core is halted
730/742 Doc ID 018940 Rev 1
RM0091