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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STR720 Scheda tecnica(PDF) 324 Page - STMicroelectronics |
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STR720 Scheda tecnica(HTML) 324 Page - STMicroelectronics |
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324 / 401 page  STR720 - EXTENDED FUNCTION TIMER (EFT) 324/401 21.3.8 Pulse Width Modulation Input The PWM Input functionality enables the measurement of the period and the pulse width of an external waveform. The initial edge is programmable. It uses the two Input Capture registers and the Input signal of the Input Capture A module. 21.3.8.1 Procedure The CR2 register must be programmed as needed for Interrupts and DMAs. To use pulse width modulation mode select the following in the CR1 register: – set the PWMI bit – Select the first edge in IEDGA – Select the second edge IEDGB as the negated of IEDGA – Program the clock source and prescaler as needed – Enable the counter setting the EN bit. To have a coherent measure the interrupt/DMA should be linked to the Input Capture A Interrupt, reading in ICAR the period value and in ICBR the pulse width. To obtain the time values: Where: fAPB = APB clock frequency tPRESC = Timer clock prescaler: (CC7..CC0)+1 The Input Capture A event causes the counter to be initialized to 0000h, allowing a new measure to start. The first Input Capture on ICAPA do not generate the corresponding interrupt request. Period = ICAR * fAPB tPRESC Pulse = ICBR * fAPB tPRESC 1 |
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