MC80F0424 Datasheet, PDF (93/135 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0424/0432/0448
The 6-bit counter is cleared and starts the counting by writing sig-
nal at BUZR register. It is incremental from 00_H until it matches
6-bit BUR value.
When main-frequency is 4MHz, buzzer frequency is shown as
below Table 18-1.
BUR
[5:0]
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
00
250.000
125.000
83.333
62.500
50.000
41.667
35.714
31.250
27.778
25.000
22.727
20.833
19.231
17.857
16.667
15.625
14.706
13.889
13.158
12.500
11.905
11.364
10.870
10.417
10.000
9.615
9.259
8.929
8.621
8.333
8.065
7.813
BUR[7:6]
01
10
125.000
62.500
41.667
31.250
25.000
20.833
17.857
15.625
62.500
31.250
20.833
15.625
12.500
10.417
8.929
7.813
13.889
12.500
11.364
10.417
9.615
8.929
8.333
7.813
6.944
6.250
5.682
5.208
4.808
4.464
4.167
3.906
7.353
6.944
6.579
6.250
5.952
5.682
5.435
5.208
3.676
3.472
3.289
3.125
2.976
2.841
2.717
2.604
5.000
4.808
4.630
4.464
4.310
4.167
4.032
3.906
2.500
2.404
2.315
2.232
2.155
2.083
2.016
1.953
11
31.250
15.625
10.417
7.813
6.250
5.208
4.464
3.906
3.472
3.125
2.841
2.604
2.404
2.232
2.083
1.953
1.838
1.736
1.645
1.563
1.488
1.420
1.359
1.302
1.250
1.202
1.157
1.116
1.078
1.042
1.008
0.977
BUR
[5:0]
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
34
35
36
37
38
39
3A
3B
3C
3D
3E
3F
00
7.576
7.353
7.143
6.944
6.757
6.579
6.410
6.250
6.098
5.952
5.814
5.682
5.556
5.435
5.319
5.208
5.102
5.000
4.902
4.808
4.717
4.630
4.545
4.464
4.386
4.310
4.237
4.167
4.098
4.032
3.968
3.907
Table 18-1 buzzer frequency (kHz unit)
BUR[7:6]
01
10
3.788
3.676
3.571
3.472
3.378
3.289
3.205
3.125
1.894
1.838
1.786
1.736
1.689
1.645
1.603
1.563
3.049
2.976
2.907
2.841
2.778
2.717
2.660
2.604
1.524
1.488
1.453
1.420
1.389
1.359
1.330
1.302
2.551
2.500
2.451
2.404
2.358
2.315
2.273
2.232
1.276
1.250
1.225
1.202
1.179
1.157
1.136
1.116
2.193
2.155
2.119
2.083
2.049
2.016
1.984
1.953
1.096
1.078
1.059
1.042
1.025
1.008
0.992
0.977
11
0.947
0.919
0.893
0.868
0.845
0.822
0.801
0.781
0.762
0.744
0.727
0.710
0.694
0.679
0.665
0.651
0.638
0.625
0.613
0.601
0.590
0.579
0.568
0.558
0.548
0.539
0.530
0.521
0.512
0.504
0.496
0.488
MAR. 2005 Ver 0.2
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