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FS9701B Datasheet(PDF) 14 Page - Fortune Semiconductor Corp. |
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FS9701B Datasheet(HTML) 14 Page - Fortune Semiconductor Corp. |
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14 / 46 page  FS970X Rev. 4.4 14/46 9. Clock and Buzzer Generator Clock Generator 4.0000 MHz FS FS F TB 1/FS 1/FTB ENOSCO_ ENXTL_ FTB TBDIV FSDIV Buzzer VBAT ENBP CNTBP FBP CLK DIVIDER OSCO 2 XTALI 3 XTALO 4 BZR 58 OSCO Graph 4 Clock Generator. Clock generator is shown in Graph 4. It can be connected to a 4.000 MHz crystal oscillator to produce 4.000 MHz clock frequency. It can then be divided to FS, FTB, and FBP frequencies by a divider. Among these, FS is used by ADC. (please refer to 8.4 for details.) FTB is used by digital circuits, such as the reference frequency of frequency counter (please refer to section 9.1). FBP is used by buzzer to initiate buzzing. FTB and FS are respectively controlled by ENXTAL_. TBDIV and FSDIV. The true value Chart is shown in Chart 3: ENXTAL_ TBDIV FTB FSDIV FS L L 1.0000 MHz L 166.67 kHz L L 1.0000 MHz H 83.33 kHz L H 125.0 kHz L 166.67 kHz L H 125.0 kHz H 83.33 kHz H X 0, (L) X 0, (L) Chart 3. FTB / FS generator true value Chart. |
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