PWM Capture and PWM Output share the same hardware. When a rising edge or a falling edge occurs, the value of a PWM counter will be latched into the corresponding rising or falling latch register. At this time, whether to reload the PWM counter or an interrupt event occurs can be determined.

The PWM Capture is mainly used to measure the input waveform of high level and (or) a high-level pulse width. The following diagram is used as example for illustration:

To measure the time W2 from a rising edge to a falling edge (high level), the user can set the PWM counter reload value CN when a rising edge occurs. A falling latch value CFL can be obtained when a falling edge occurs. The time W2 can be calculated using the following formula:

(CN+1-CFL)*(prescale+1)*(clock divider)/PWM_CLK

Note: prescale: 8-bit prescale

clock divider: divider options

PWM_CLK: PWM clock source frequency

Products:	Microcontrollers ,Arm Cortex-M0 MCUs ,M051 Base Series ,M0518 Series ,M0519 Series ,Mini51 Base Series ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC029 Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC131/NUC1311 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series
Applications:
Function:	Peripherals,Timer and PWM,PWM-Capture

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What is the main function of PWM Capture? Issue Date：2015-05-27

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