Advanced-control timers (TIM1/TIM8/TIM20) RM0440
1100/2126 RM0440 Rev 4
Figure 281. Counter timing diagram, internal clock divided by N
Figure 282. Counter timing diagram, update event when repetition counter is not used
Center-aligned mode (up/down counting)
In center-aligned mode, the counter counts from 0 to the auto-reload value (content of the
TIMx_ARR register) – 1, generates a counter overflow event, then counts from the auto-
MSv62308V1
001F20
tim_psc_ck
tim_cnt_ck
Counter register
Update event (UEV)
Counter underflow
Update interrupt flag
(UIF)
36
MSv62309V1
FF 36
tim_pasc_ck
tim_cnt_ck
Counter register
Update event (UEV)
Counter underflow
Update interrupt flag
(UIF)
0002030405 30 2F3233343536 3101
CEN
Auto-reload preload
register
Write a new value in TIMx_ARR
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