GMS81C2012 Datasheet, PDF(70/107 Page) Hynix Semiconductor – HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C2012 Datasheet, PDF (70/107 Pages) Hynix Semiconductor – HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

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]

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

BUR[7:6]

125.000

62.500

41.667

31.250

25.000

20.833

17.857

62.500

31.250

20.833

15.625

12.500

10.417

8.929

15.625

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

7.813

7.353

6.944

6.579

6.250

5.952

5.682

5.435

3.906

3.676

3.472

3.289

3.125

2.976

2.841

2.717

5.208

5.000

4.808

4.630

4.464

4.310

4.167

4.032

2.604

2.500

2.404

2.315

2.232

2.155

2.083

2.016

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

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]

7.813

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

BUR[7:6]

3.906

3.788

3.676

3.571

3.472

3.378

3.289

3.205

1.953

1.894

1.838

1.786

1.736

1.689

1.645

1.603

3.125

3.049

2.976

2.907

2.841

2.778

2.717

2.660

1.563

1.524

1.488

1.453

1.420

1.389

1.359

1.330

2.604

2.551

2.500

2.451

2.404

2.358

2.315

2.273

1.302

1.276

1.250

1.225

1.202

1.179

1.157

1.136

2.232

2.193

2.155

2.119

2.083

2.049

2.016

1.984

1.116

1.096

1.078

1.059

1.042

1.025

1.008

0.992

0.977

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

MAR. 2000 Ver 1.00

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