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AT90PWM2 Datasheet(PDF) 144 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 144 Page - ATMEL Corporation |
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144 / 365 page  144 AT90PWM2/3 4317A-3–AVR–02/05 Then the frequency resolution is divided by 16. In the example above, the resolution equals 25 Hz. Frequency distribution The frequency modulation is done by switching two frequencies in a 16 consecutive cycle frame. These two frequencies are f b1 and fb2 where fb1 is the nearest base fre- quency above the wanted frequency and f b2 is the nearest base frequency below the wanted frequency. The number of f b1 in the frame is (d-16) and the number of fb2 is d. The f b1 and fb2 frequencies are evenly distributed in the frame according to a predefined pattern. This pattern can be as given in the following table or by any other implementa- tion which give an equivallent evenly distribution. Table 56. Distribution of f b2 in the modulated frame While ‘X’ in the table, f b2 prime to fb1 in cycle corresponding cycle. So for each row, a number of fb2 take place of fb1. f AV ERAGE 16 d – 16 --------------- f PLL n ---------- × d 16 ------ f PLL n 1 + ------------ × + = Distribution of fb2 in the modulated frame PWM - cycle Fractional Divider (d) 012 345 678 910 11 12 13 14 15 0 1 X 2 XX 3 XXX 4 XXX X 5 XX X X X 6 X X X XXX 7 X XXX XXX 8 X XXX XXX X 9 X X XXX XXX X 10 X X XXX X X XX X 11 XXX XX X X XX X X 12 XXX XX X X XX XXX 13 XXX XXX X X XX XXX 14 XXX XXX X X XXX XXX 15 XXX XXX XXX XXX XXX |
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