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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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141
4317J–AVR–08/10
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 fb1 and fb2 where fb1 is the nearest base frequency above the wanted
frequency and fb2 is the nearest base frequency below the wanted frequency. The number of fb1
in the frame is (d-16) and the number of fb2 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 fb2 in the modulated frame
While ‘X’ in the table, fb2 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)
0123
4567
8910
11
12
13
14
15
0
1X
2X
X
3
XXX
4
XXXX
5
X
X
XXX
6X
X
X
X
X
X
7
X
XX
XX
XX
8
X
XX
XX
XX
X
9
X
X
X
XX
XX
XX
10
XXX
X
X
XXX
X
X
11
XXX
XXX
XXX
X
X
12
XXX
XXX
XXX
XXX
13
XXXX
XXX
XXX
XXX
14
XXXX
XXX
XXXX
XXX
15
XXXX
XXXX
XXXX
XXX
fb1
fb2
d:
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
f
OP



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