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參數(shù)資料
| 型號(hào)： | STM32W108HBU7 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-40 |
| 文件頁(yè)數(shù)： | 17/198頁(yè) |
| 文件大?。?/td> | 2871K |
| 代理商： | STM32W108HBU7 |
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STM32W108CB, STM32W108HB
General-purpose timers
Doc ID 16252 Rev 3
113/198
●
Enable capture from the counter into the capture register by setting the TIM_CC1E bit
in the TIMx_CCER register.
●
If needed, enable the related interrupt request by setting the INT_TIMCC1IF bit in the
INT_TIMxCFG register.
●
When an input capture occurs:
–
The TIMx_CCR1 register gets the value of the counter on the active transition.
–
INT_TIMCC1IF flag is set (capture/compare interrupt flag). The missed
capture/compare flag INT_TIMMISSCC1IF in INT_TIMxMISS is also set if another
capture occurs before the INT_TIMCC1IF flag is cleared.
–
An interrupt may be generated if enabled by the INT_TIMCC1IF bit.
To detect missed captures reliably, read captured data in TIMxCCRy before checking the
missed capture/compare flag. This sequence avoids missing a capture that could happen
after reading the flag and before reading the data.
Note:
Software can generate IC interrupt requests by setting the corresponding TIM_CCyG bit in
the TIMx_EGR register.
10.1.6
PWM input mode
This mode is a particular case of input capture mode. The procedure is the same except:
●
Two ICy signals are mapped on the same TIy input.
●
These two ICy signals are active on edges with opposite polarity.
●
One of the two TIyFP signals is selected as trigger input and the slave mode controller
is configured in reset mode.
For example, to measure the period in the TIMx_CCR1 register and the duty cycle in the
TIMx_CCR2 register of the PWM applied on TI1, use the following procedure depending on
CK_INT frequency and prescaler value:
●
Select the active input for TIMx_CCR1: write the TIM_CC1S bits to 01 in the
TIMx_CCMR1 register (TI1 selected).
●
Select the active polarity for TI1FP1, used both for capture in the TIMx_CCR1 and
counter clear, by writing the TIM_CC1P bit to 0 (active on rising edge).
●
Select the active input for TIMx_CCR2by writing the TIM_CC2S bits to 10 in the
TIMx_CCMR1 register (TI1 selected).
●
Select the active polarity for TI1FP2 (used for capture in the TIMx_CCR2) by writing the
TIM_CC2P bit to 1 (active on falling edge).
●
Select the valid trigger input by writing the TIM_TS bits to 101 in the TIMx_SMCR
register (TI1FP1 selected).
●
Configure the slave mode controller in reset mode by writing the TIM_SMS bits to 100
in the TIMx_SMCR register.
●
Enable the captures by writing the TIM_CC1E and TIM_CC2E bits to 1 in the
TIMx_CCER register.
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