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GMS81C2112 Datasheet(PDF) 70 Page - Hynix Semiconductor |
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GMS81C2112 Datasheet(HTML) 70 Page - Hynix Semiconductor |
70 / 107 page GMS81C2112/GMS81C2120 64 JUNE. 2001 Ver 1.00 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. 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] BUR[7:6] BUR [5:0] BUR[7:6] 00 01 10 11 00 01 10 11 00 01 02 03 04 05 06 07 250.000 125.000 83.333 62.500 50.000 41.667 35.714 31.250 125.000 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 31.250 15.625 10.417 7.813 6.250 5.208 4.464 3.906 20 21 22 23 24 25 26 27 7.576 7.353 7.143 6.944 6.757 6.579 6.410 6.250 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 0.947 0.919 0.893 0.868 0.845 0.822 0.801 0.781 08 09 0A 0B 0C 0D 0E 0F 27.778 25.000 22.727 20.833 19.231 17.857 16.667 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 3.906 3.472 3.125 2.841 2.604 2.404 2.232 2.083 1.953 28 29 2A 2B 2C 2D 2E 2F 6.098 5.952 5.814 5.682 5.556 5.435 5.319 5.208 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 0.762 0.744 0.727 0.710 0.694 0.679 0.665 0.651 10 11 12 13 14 15 16 17 14.706 13.889 13.158 12.500 11.905 11.364 10.870 10.417 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 1.838 1.736 1.645 1.563 1.488 1.420 1.359 1.302 30 31 32 33 34 35 36 37 5.102 5.000 4.902 4.808 4.717 4.630 4.545 4.464 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 0.638 0.625 0.613 0.601 0.590 0.579 0.568 0.558 18 19 1A 1B 1C 1D 1E 1F 10.000 9.615 9.259 8.929 8.621 8.333 8.065 7.813 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 1.250 1.202 1.157 1.116 1.078 1.042 1.008 0.977 38 39 3A 3B 3C 3D 3E 3F 4.386 4.310 4.237 4.167 4.098 4.032 3.968 3.907 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 0.548 0.539 0.530 0.521 0.512 0.504 0.496 0.488 |
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