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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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UPD17708 Datasheet(PDF) 240 Page - NEC |
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UPD17708 Datasheet(HTML) 240 Page - NEC |
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240 / 356 page  240 µPD17704, 17705, 17707, 17708, 17709 16.2.10 Cautions on setting and reading data Data is set to the presettable shift register 0 by using the “PUT SIO0SFR, DBF” instruction. To read the data of this register, the “GET DBF, SIO0SFR” instruction is used. Set or read data of the register in the wait status. If the wait status is released, data may not be correctly set or read depending on the status of the shift clock pin. The following table shows the data setting and reading timing, and points to be noted. Table 16-3. Reading and Writing Data of Presettable Shift Register 0 and Cautions Status on Execution Status of Shift I2C Bus Mode Serial I/O Mode of PUT/GET Clock Pin Wait Read (GET) • I2C bus mode: Normal read Normal read status Write (PUT) fixed to low Normal write Normal write • Serial I/O mode: Outputs contents of MSB when wait Outputs contents of MSB when wait fixed to high status is released next time status is released next time and shift (during transmission) clock pin goes low (during transmission) Wait Read (GET) High level Cannot be read normally Cannot be read normally released Contents of SIO0SFR are lost Contents of SIO0SFR are lost status Low level Normal read Normal read Write (PUT) High level Normal write Normal write Outputs contents of MSB at falling Outputs contents of MSB when PUT of clock next to one at which PUT instruction is executed. instruction has been executed. Clock counter is not reset Clock counter is not reset Low level Cannot be read normally Cannot be read normally Contents of SIO0SFR are lost Contents of SIO0SFR are lost MSB Data Wait released PUT SIO0SFR, DBF Clock H L 1 0 MSB Data Wait released PUT SIO0SFR, DBF Clock H L 1 0 MSB Data Clock H L 1 0 PUT SIO0SFR, DBF MSB Data PUT SIO0SFR, DBF Clock H L 1 0 |
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