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EM357-RTR 数据表(PDF) 148 Page - Silicon Laboratories |
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EM357-RTR 数据表(HTML) 148 Page - Silicon Laboratories |
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148 / 241 page ![]() Rev 1.3 148 TIM1_SMCR: Address: 0x4000E008 Reset: 0x0 TIM2_SMCR: Address: 0x4000F008 Reset: 0x0 Register 9.3. TIMx_SMCR TIM1_SMCR: Timer 1 Slave Mode Control Register TIM2_SMCR: Timer 2 Slave Mode Control Register Bit 31 30 29 28 27 26 25 24 Name 0 0 0 0 0 0 0 0 Bit 23 22 21 20 19 18 17 16 Name 0 0 0 0 0 0 0 0 Bit 15 14 13 12 11 10 9 8 Name TIM_ETP TIM_ECE TIM_ETPS TIM_ETF Bit 7 6 5 4 3 2 1 0 Name TIM_MSM TIM_TS 0 TIM_SMS Bitname Bitfield Access Description TIM_ETP [15] RW External Trigger Polarity. This bit selects whether ETR or the inverse of ETR is used for trigger opera- tions. 0: ETR is non-inverted, active at a high level or rising edge. 1: ETR is inverted, active at a low level or falling edge. TIM_ECE [14] RW 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. Notes: 1. Setting the TIM_ECE bit has the same effect as selecting external clock mode 1 with TRGI connected to ETRF (TIM_SMS=111 and TIM_TS=111). 2. It is possible to use this mode simultaneously with the following slave modes: reset mode, gated mode and trigger mode. TRGI must not be connected to ETRF in this case (the TIM_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 will be ETRF. TIM_ETPS [13:12] RW External Trigger Prescaler. External trigger signal ETRP frequency must be at most 1/4 of CK frequency. A prescaler can be enabled to reduce ETRP frequency. It is useful with fast external clocks. 00: ETRP prescaler off. 01: Divide ETRP frequency by 2. 10: Divide ETRP frequency by 4. 11: Divide ETRP frequency by 8. |
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