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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSPIC30F5015 датащи(PDF) 87 Page - Microchip Technology |
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DSPIC30F5015 датащи(HTML) 87 Page - Microchip Technology |
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87 / 234 page  © 2011 Microchip Technology Inc. DS70149E-page 87 dsPIC30F5015/5016 13.4.2 PWM PERIOD The PWM period is specified by writing to the PRx register. The PWM period can be calculated using Equation 13-1. EQUATION 13-1: PWM PERIOD PWM frequency is defined as 1/[PWM period]. When the selected TMRx is equal to its respective Period register, PRx, the following four events occur on the next increment cycle: • TMRx is cleared. • The OCx pin is set. - Exception 1: If PWM duty cycle is 0x0000, the OCx pin will remain low. - Exception 2: If duty cycle is greater than PRx, the pin will remain high. • The PWM duty cycle is latched from OCxRS into OCxR. • The corresponding timer interrupt flag is set. See Figure 13-1 for key PWM period comparisons. Timer3 is referred to in the figure for clarity. FIGURE 13-1: PWM OUTPUT TIMING PWM Period = [(PRx) + 1] • 4 • TOSC • (TMRx Prescale Value) Period Duty Cycle TMR3 = Duty Cycle (OCxR) TMR3 = Duty Cycle (OCxR) TMR3 = PR3 T3IF = 1 (Interrupt Flag) OCxR = OCxRS TMR3 = PR3 (Interrupt Flag) OCxR = OCxRS T3IF = 1 |
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