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STM32W108HB Datasheet(PDF) 89 Page - STMicroelectronics |
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STM32W108HB Datasheet(HTML) 89 Page - STMicroelectronics |
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89 / 179 page  STM32W108CB, STM32W108HB General-purpose timers Doc ID 16252 Rev 2 89/179 Internal clock source (CK_INT) The internal clock is selected when the slave mode controller is disabled (TIM_SMS = 000 in the TIMx_SMCR register). In this mode, the TIM_CEN, TIM_DIR (in the TIMx_CR1 register), and TIM_UG bits (in the TIMx_EGR register) are actual control bits and can be changed only by software, except for TIM_UG, which remains cleared automatically. As soon as the TIM_CEN bit is written to 1, the prescaler is clocked by the internal clock CK_INT. Figure 21 shows the behavior of the control circuit and the up-counter in normal mode, without prescaling. Figure 21. Control circuit in Normal mode, internal clock divided by 1 External clock source mode 1 This mode is selected when TIM_SMS = 111 in the TIMx_SMCR register. The counter can count at each rising or falling edge on a selected input. Figure 22. TI2 external clock connection example For example, to configure the up-counter to count in response to a rising edge on the TI2 input, use the following procedure: 1. Configure channel 2 to detect rising edges on the TI2 input by writing TIM_CC2S = 01 in the TIMx_CCMR1 register. 2. Configure the input filter duration by writing the TIM_IC2F bits in the TIMx_CCMR1 register (if no filter is needed, keep TIM_IC2F = 0000). |
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