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GMS81C2112 Datasheet, PDF (70/107 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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GMS81C2112/GMS81C2120
Note: BUR is undefined after reset, so it must be initialized
to between 1H and 3FH by software.
Note that BUR is a write-only register.
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
The 6-bit counter is cleared and starts the counting by writ-
ing signal at BUR register. It is incremental from 00H until
it matches 6-bit BUR value.
When main-frequency is 4MHz, buzzer frequency is
shown as below table.
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
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
64
JUNE. 2001 Ver 1.00
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