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ST7LITE20F2 数据表(PDF) 76 Page - STMicroelectronics |
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ST7LITE20F2 数据表(HTML) 76 Page - STMicroelectronics |
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76 / 166 page  On-chip peripherals ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 76/166 Doc ID 8349 Rev 5 Figure 36. PWM function Figure 37. PWM signal from 0% to 100% duty cycle Output compare mode To use this function, load a 12-bit value in the DCRxH and DCRxL registers. When the 12-bit upcounter (CNTR) reaches the value stored in the DCRxH and DCRxL registers, the CMPF bit in the PWMxCSR register is set and an interrupt request is generated if the CMPIE bit is set. Note: The output compare function is only available for DCRx values other than 0 (reset value). Break function The break function is used to perform an emergency shutdown of the power converter. The break function is activated by the external BREAK pin (active low). In order to use the BREAK pin it must be previously enabled by software setting the BPEN bit in the BREAKCR register. When a low level is detected on the BREAK pin, the BA bit is set and the break function is activated. Duty cycle register Auto-reload register t 4095 000 With OE=1 and OPx=0 (ATR) (DCRx) With OE=1 and OPx=1 COUNTER t FFDh FFEh FFFh FFDh FFEh FFFh FFDh FFEh DCRx=000h DCRx=FFDh DCRx=FFEh DCRx=000h ATR= FFDh fCOUNTER |
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