MOTOROLA
Chapter 17. Modular Input/Output Subsystem (MIOS14)
17-53
MIOS14 Pulse Width Modulation Submodule (MPWMSM)
NOTE
When a PWM output period is selected to be 65536 PWM
clocks by loading 0x0000 in the period register, it is not
possible to have an 100% duty cycle output signal. In this case,
the maximum duty cycle available is of 65535/65536.
17.10.3.6 Pulse/Frequency Range Table
Table 17-24 summarizes the frequency and minimum pulse width values that can be
obtained respectively with divide-by-1 and divide-by-256 MPWMSM clock prescaler
options, while using a MIOS14 CLOCK frequency of 40 MHz, and for each MCPSM clock
divide ratios.
Table 17-24. PWM Pulse/Frequency Ranges (in Hz) Using /1 or /256 Option (40 MHz)
Minimum
Pulse Width
Bits of Resolution
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
With /1 Option
50 ns/2
305
610
1220
2441
4882
9765 19.5K
39K
78K
156K 312K 625K 1250 K 2500K 5000K 10000K
75 ns/3
203
407
814
1628
3255
6510
13K
26K
52K
104K 208K 416K 833 K 1666K 3333K 6666K
100 ns/4
152
305
610
1220
2441
4882
9765 19.5K
39K
78K
156K 312K 625 K 1250K 2500K 5000K
125 ns/5
122
244
488
976
1953
3906
7812 15.6K 31.3K 62.5K 125K 250K 500 K 1000K 2000K 4000K
150 ns/6
101
203
407
814
1628
3255
6510
13K
26K
52K
104K 208K 416 K
833K 1666K 3333K
175 ns/7
87.2
174
348
697
1395
2790
5580 11.1K 22.3K 44.6K 89.3K 178K
357K
714K 1428K 2857K
200 ns/8
76.3
152
305
610
1220
2441
4882
9765 19.5K
39K
78K 156 K 312 K
625K 1250K 2500K
225 ns/9
67.8
135
271
542
1085
2170
4340
8680 17.3K 34.7K 69.4K 138K
277K
555K 1111K 2222K
250 ns/10
61
122
244
488
976
1953
3906
7812
15.K
31.3K 62.5K 125K 250 K 500 K 1000K 2000K
275 ns/11
55.5
111
222
443
887
1775
3551
7102 14.2K 28.4K 56.8K 113K
227 K
454K 909 K 1818 K
300 ns/12
50.8
101
203
407
814
1628
3255
6510
13K
26K
52K
104K 208 K
416K 833 K 1666 K
325 ns/13
46.9
93.9
187
375
751
1502
3004
6009
12K
24K
48K 96.1K 192 K
384K 769 K 1538 K
350 ns/14
43.6
87.2
174
348
697
1395
2790
5580 11.1K 22.3 K 44.6K 89.3K 178 K
357K 714 K 1428K
375 ns/15
40.7
81.4
162
325
651
1302
2604
5208 10.4K 20.8 K 41.6K 83.3K 166 K
333K 666 K 1333 K
400 ns/16
38.1
76.3
152
305
610
1220
2441
4882
9765 19.5K
39K
78K
156K
312K
625K
1250K
With /256 Option
12.8
s/512 1.192 2.384 4.768 9.536 19.07 38.14 76.29 152.5 305.1 610.3 1220 2441 4882 9765 19.5K
39K
19.2
s/768 0.794 1.589 3.178 6.357 12.71 25.43 50.86 101.7 203.4 406.9 813.8 1627 3255 6510 13 K
26K
25.6
s/1024 0.596 1.192 2.384 4.768 9.536 19.07 38.14 76.29 152.5 305.1 610.3 1220 2441 4882 9765 19.5K
32
s/1280 0.476 0.953 1.907 3.814 7.629 15.24 30.51 61.03 122 244.1 488.2 976.5 1953 3906 7812 15.6K