
MC68F375
CONFIGURABLE TIMER MODULE (CTM9)
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
13-43
13.7.10 PWM Frequency
The relationship between the PWM output frequency (fPWMO) and the MCU system
Table 13-12 PWM Pulse and Frequency Ranges (in Hz)
Using /2 Option (16.78 MHz)
Minimum
Pulse Width
Bits of Resolution
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0.119s/2
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
262
k
524
k
104
9k
209
7k
419
5k
0.238s/4
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
262
k
524
k
104
9k
209
7k
0.477s/8
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
262
k
524
k
104
9k
0.954s/16
16
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
262
k
524
k
1.91s/32
8.0
16
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
262
k
3.81s/64
4.0
8.0
16
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
131
k
7.63s/128
2.0
4.0
8.0
16
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
327
68
65.5
k
30.5s/512
0.5
1.0
2.0
4.0
8.0
16
32
64
128
256
512
102
4
204
8
409
6
819
2
163
84
Table 13-13 PWM Pulse and FrequencyRanges (in Hz)
Using /3 Option (16.78 MHz)
Minimum
Pulse Width
Bits of Resolution
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0.179s/3
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
174.
8k
349.
5k
699.
1k
139
8k
279
6k
0.358s/6
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
174.
8k
349.
5k
699.
1k
139
8k
0.715s/12
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
174.
8k
349.
5k
699.
1k
1.431s/24
10.6
7
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
174.
8k
349.
5k
2.861s/48
5.33
3
10.6
7
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
174.
8k
5.722s/96
2.66
7
5.33
3
10.6
7
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
87.3
8k
11.44s/192
1.33
3
2.66
7
5.33
3
10.6
7
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
218
45
43.6
9k
45.78s/768
0.33
3
0.66
7
1.33
3
2.66
7
5.33
3
10.6
7
21.3
3
42.6
7
85.3
3
170.
7
341.
3
682.
7
136
5
273
1
546
1
109
23
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