MC81F4432
21.2 Frequency table
System Clock = 4MHz
BUCK :01 = div16
frequency unit = KHz
Low nibble of BUPDR
High
nibble
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
125.000
7.353
3.788
2.551
1.923
1.543
1.289
1.106
0.969
0.862
0.776
0.706
0.648
0.598
0.556
0.519
62.500 41.667 31.250 25.000 20.833 17.857 15.625
6.944
3.676
2.500
1.894
1.524
1.276
1.096
0.962
0.856
0.772
0.702
0.644
0.595
0.553
0.517
6.579
3.571
2.451
1.866
1.506
1.263
1.087
0.954
0.850
0.767
0.698
0.641
0.592
0.551
0.514
6.250
3.472
2.404
1.838
1.488
1.250
1.078
0.947
0.845
0.762
0.694
0.638
0.590
0.548
0.512
5.952
3.378
2.358
1.812
1.471
1.238
1.068
0.940
0.839
0.758
0.691
0.635
0.587
0.546
0.510
5.682
3.289
2.315
1.786
1.453
1.225
1.059
0.933
0.833
0.753
0.687
0.631
0.584
0.543
0.508
5.435
3.205
2.273
1.761
1.437
1.214
1.050
0.926
0.828
0.749
0.683
0.628
0.581
0.541
0.506
5.208
3.125
2.232
1.736
1.420
1.202
1.042
0.919
0.822
0.744
0.679
0.625
0.579
0.539
0.504
Low nibble of BUPDR
High
nibble
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
13.889
5.000
3.049
2.193
1.712
1.404
1.190
1.033
0.912
0.817
0.740
0.676
0.622
0.576
0.536
0.502
12.500 11.364 10.417
9.615
4.310
2.778
2.049
1.623
1.344
1.147
1.000
0.887
0.796
0.723
0.661
0.610
0.566
0.527
0.494
8.929
4.167
2.717
2.016
1.603
1.330
1.136
0.992
0.880
0.791
0.718
0.658
0.607
0.563
0.525
0.492
8.333
4.032
2.660
1.984
1.582
1.316
1.126
0.984
0.874
0.786
0.714
0.654
0.604
0.561
0.523
0.490
7.813
3.906
2.604
1.953
1.563
1.302
1.116
0.977
0.868
0.781
0.710
0.651
0.601
0.558
0.521
0.488
4.808
2.976
2.155
1.689
1.389
1.179
1.025
0.906
0.812
0.735
0.672
0.619
0.573
0.534
0.500
4.630
2.907
2.119
1.667
1.374
1.168
1.016
0.899
0.806
0.731
0.668
0.616
0.571
0.532
0.498
4.464
2.841
2.083
1.645
1.359
1.157
1.008
0.893
0.801
0.727
0.665
0.613
0.568
0.530
0.496
Ex ) BUPDR = 0xFC
->
Freq = 0.494KHz
October 19, 2009 Ver.1.35
141
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