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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC24F04KA201 датащи(PDF) 115 Page - Microchip Technology |
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PIC24F04KA201 датащи(HTML) 115 Page - Microchip Technology |
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115 / 224 page  © 2009 Microchip Technology Inc. Preliminary DS39937B-page 113 PIC24F04KA201 FAMILY EXAMPLE 14-1: PWM PERIOD AND DUTY CYCLE CALCULATIONS(1) TABLE 14-1: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 4 MIPS (FCY = 4 MHz)(1) TABLE 14-2: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 16 MIPS (FCY = 16 MHz)(1) PWM Frequency 7.6 Hz 61 Hz 122 Hz 977 Hz 3.9 kHz 31.3 kHz 125 kHz Timer Prescaler Ratio 8 1 111 11 Period Register Value FFFFh FFFFh 7FFFh 0FFFh 03FFh 007Fh 001Fh Resolution (bits) 16 16 15 12 10 7 5 Note 1: Based on FCY = FOSC/2, Doze mode and PLL are disabled. PWM Frequency 30.5 Hz 244 Hz 488 Hz 3.9 kHz 15.6 kHz 125 kHz 500 kHz Timer Prescaler Ratio 8 1 111 11 Period Register Value FFFFh FFFFh 7FFFh 0FFFh 03FFh 007Fh 001Fh Resolution (bits) 16 16 15 12 10 7 5 Note 1: Based on FCY = FOSC/2, Doze mode and PLL are disabled. 1. Find the Timer Period register value for a desired PWM frequency of 52.08 kHz, where FOSC = 8 MHz with PLL (32 MHz device clock rate) and a Timer2 prescaler setting of 1:1. TCY = 2 * TOSC = 62.5 ns PWM Period = 1/PWM Frequency = 1/52.08 kHz = 19.2 μs PWM Period = (PR2 + 1) • TCY • (Timer 2 Prescale Value) 19.2 μs = (PR2 + 1) • 62.5 ns • 1 PR2 = 306 2. Find the maximum resolution of the duty cycle that can be used with a 52.08 kHz frequency and a 32 MHz device clock rate: PWM Resolution = log10(FCY/FPWM)/log102) bits = (log10(16 MHz/52.08 kHz)/log102) bits = 8.3 bits Note 1: Based on TCY = 2 * TOSC, Doze mode and PLL are disabled. |
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