RM0008
13.4.2
Advanced-control timers (TIM1&TIM8)
Bit 2 URS : Update request source
This bit is set and cleared by software to select the UEV event sources.
0: Any of the following events generate an update interrupt or DMA request if enabled.
These events can be:
–Counter overflow/underflow
–Setting the UG bit
–Update generation through the slave mode controller
1: Only counter overflow/underflow generates an update interrupt or DMA request if
enabled.
Bit 1 UDIS : Update disable
This bit is set and cleared by software to enable/disable UEV event generation.
0: UEV enabled. The Update (UEV) event is generated by one of the following events:
–Counter overflow/underflow
–Setting the UG bit
–Update generation through the slave mode controller
Buffered registers are then loaded with their preload values.
1: UEV disabled. The Update event is not generated, shadow registers keep their value
(ARR, PSC, CCRx). However the counter and the prescaler are reinitialized if the UG bit is
set or if a hardware reset is received from the slave mode controller.
Bit 0 CEN : Counter enable
0: Counter disabled
1: Counter enabled
Note: External clock, gated mode and encoder mode can work only if the CEN bit has been
previously set by software. However trigger mode can set the CEN bit automatically by
hardware.
TIM1&TIM8 control register 2 (TIMx_CR2)
Address offset: 0x04
Reset value: 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OIS4
OIS3N
OIS3
OIS2N
OIS2
OIS1N
OIS1
TI1S
MMS[2:0]
CCDS
CCUS
CCPC
Res.
Res.
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Bit 15 Reserved, always read as 0
Bit 14 OIS4 : Output Idle state 4 (OC4 output)
refer to OIS1 bit
Bit 13 OIS3N : Output Idle state 3 (OC3N output)
refer to OIS1N bit
Bit 12 OIS3 : Output Idle state 3 (OC3 output)
refer to OIS1 bit
Bit 11 OIS2N : Output Idle state 2 (OC2N output)
refer to OIS1N bit
Bit 10 OIS2 : Output Idle state 2 (OC2 output)
refer to OIS1 bit
Doc ID 13902 Rev 9
295/995
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