Advanced-control timers (TIM1&TIM8) RM0390
462/1328 RM0390 Rev 4
Figure 128. Counter timing diagram, update event with ARPE=1 (counter underflow)
Figure 129. Counter timing diagram, update event with ARPE=1 (counter overflow)
16.3.3 Repetition counter
Section 16.3.1: Time-base unit describes how the update event (UEV) is generated with
respect to the counter overflows/underflows. It is actually generated only when the repetition
counter has reached zero. This can be useful when generating PWM signals.
This means that data are transferred from the preload registers to the shadow registers
(TIMx_ARR auto-reload register, TIMx_PSC prescaler register, but also TIMx_CCRx
capture/compare registers in compare mode) every N+1 counter overflows or underflows,
where N is the value in the TIMx_RCR repetition counter register.
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