TIM4_CNTR register is used for counting value. TIM4_PSCR = 0x01 will divide input clock with 2 and finally 0th bit of TIM4_CR1 is used to enable or disable timer

TIM4_CNTR register is used for counting value. TIM4_PSCR = 0x01 will divide input clock with 2 and finally 0th bit of TIM4_CR1 is used to enable or disable timer