STMicroelectronics STM32F05 series Reference Manual page 358

General-purpose timer (TIM14)
Figure 144. Counter timing diagram, update event when ARPE=0 (TIMx_ARR not
Figure 145. Counter timing diagram, update event when ARPE=1 (TIMx_ARR
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preloaded)
CK_PSC
CEN
Timer clock = CK_CNT
Counter register
Counter overflow
Update event (UEV)
Update interrupt flag (UIF)
Auto-reload register
Write a new value in TIMx_ARR
preloaded)
CK_PSC
CEN
Timer clock = CK_CNT
Counter register
Counter overflow
Update event (UEV)
Update interrupt flag (UIF)
Auto-reload preload register
Auto-reload shadow register
Write a new value in TIMx_ARR
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RM0091
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