from stm32f446xx.h:15632
#define IS_TIM_MASTER_INSTANCE(INSTANCE) (((INSTANCE) == TIM1) || \
((INSTANCE) == TIM2) || \
((INSTANCE) == TIM3) || \
((INSTANCE) == TIM4) || \
((INSTANCE) == TIM5) || \
((INSTANCE) == TIM6) || \
((INSTANCE) == TIM7) || \
((INSTANCE) == TIM8))