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RM0008
13.4.3
Advanced-control timers (TIM1&TIM8)
TIM1&TIM8 slave mode control register (TIMx_SMCR)
Address offset: 0x08
Reset value: 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ETP
ECE
ETPS[1:0]
ETF[3:0]
MSM
TS[2:0]
Res.
SMS[2:0]
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Res.
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Bit 15 ETP : External trigger polarity
This bit selects whether ETR or ETR is used for trigger operations
0: ETR is non-inverted, active at high level or rising edge.
1: ETR is inverted, active at low level or falling edge.
Bit 14 ECE : External clock enable
This bit enables External clock mode 2.
0: External clock mode 2 disabled.
1: External clock mode 2 enabled. The counter is clocked by any active edge on the ETRF
signal.
Note: 1: Setting the ECE bit has the same effect as selecting external clock mode 1 with
TRGI connected to ETRF (SMS=111 and TS=111).
2: It is possible to simultaneously use external clock mode 2 with the following slave
modes: reset mode, gated mode and trigger mode. Nevertheless, TRGI must not be
connected to ETRF in this case (TS bits must not be 111).
3: If external clock mode 1 and external clock mode 2 are enabled at the same time,
the external clock input is ETRF.
Bits 13:12 ETPS[1:0] : External trigger prescaler
External trigger signal ETRP frequency must be at most 1/4 of TIMxCLK frequency. A
prescaler can be enabled to reduce ETRP frequency. It is useful when inputting fast external
clocks.
00: Prescaler OFF.
01: ETRP frequency divided by 2.
10: ETRP frequency divided by 4.
11: ETRP frequency divided by 8.
Doc ID 13902 Rev 9
297/995
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