ST STM32F405 Reference Manual page 186

Reset and clock control for STM32F42xxx and STM32F43xxx (RCC)
Bit 3 TIM5EN: TIM5 clock enable
Bit 2 TIM4EN: TIM4 clock enable
Bit 1 TIM3EN: TIM3 clock enable
Bit 0 TIM2EN: TIM2 clock enable
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This bit is set and cleared by software.
0: TIM5 clock disabled
1: TIM5 clock enabled
This bit is set and cleared by software.
0: TIM4 clock disabled
1: TIM4 clock enabled
This bit is set and cleared by software.
0: TIM3 clock disabled
1: TIM3 clock enabled
This bit is set and cleared by software.
0: TIM2 clock disabled
1: TIM2 clock enabled
RM0090 Rev 18
RM0090