ST STM32F413 Reference Manual page 607

RM0430
Bit 2 URS: Update request source
Bit 1 UDIS: Update disable
Bit 0 CEN: Counter enable
CEN is cleared automatically in one-pulse mode, when an update event occurs.
This bit is set and cleared by software to select the UEV event sources.
0: Any of the following events generates an update interrupt if enabled:
– Counter overflow
– Setting the UG bit
1: Only counter overflow generates an update interrupt if enabled.
This bit is set and cleared by software to enable/disable update event (UEV) generation.
0: UEV enabled. An UEV is generated by one of the following events:
– Counter overflow
– Setting the UG bit
Buffered registers are then loaded with their preload values.
1: UEV disabled. No UEV is generated, shadow registers keep their value (ARR, PSC,
CCRx). The counter and the prescaler are reinitialized if the UG bit is set.
0: Counter disabled
1: Counter enabled
General-purpose timers (TIM9 to TIM14)
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