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AT90PWM3 Datasheet(PDF) 141 Page - ATMEL Corporation

Part # AT90PWM3
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  361 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM3 Datasheet(HTML) 141 Page - ATMEL Corporation

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142
4317I–AVR–01/08
AT90PWM2/3/2B/3B
16.7.1
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 frequency above the wanted
frequency and f
b2 is the nearest base frequency below the wanted frequency. The number of fb1
in the frame is (d-16) and the number of f
b2 is d. The fb1 and fb2 frequencies are evenly distrib-
uted in the frame according to a predefined pattern. This pattern can be as given in the following
table or by any other implementation which give an equivallent evenly distribution.
Table 16-5.
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.
Figure 16-12. Resulting Frequency versus d.
Distribution of fb2 in the modulated frame
PWM - cycle
Fraction
al
Divider
(d)
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fb1
fb2
d:
0
1
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9 10 11 12 13 14 15
f
OP



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