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UPD17708 Datasheet(PDF) 238 Page - Renesas Technology Corp |
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UPD17708 Datasheet(HTML) 238 Page - Renesas Technology Corp |
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238 / 358 page  236 µPD17704, 17705, 17707, 17708, 17709 16.2.9 Serial I/O mode (1) Outline of serial I/O mode In the serial I/O mode, communication is carried out by using two pins, SCL and SDA, or three pins, SCK0, SO0, and SI0. (2) Timing chart Figure 16-14 shows the timing chart in the serial I/O mode. Figure 16-14. Timing Chart in Serial I/O Mode Clock counter 0 1 2 6 7 8 0 1 Serial data La D7 D6 D5 D1 D0 D7 Shift clock SIO0NWT SIO0WSTT SIO0SF8 SIO0SF9 “0” SBSTT “0” SBBSY “0” <1> <2> <3> <4> 1 1 23 7 8 <5> INT<6> <7> <1> Initial status (general-purpose input port) <2> Sets transmission status of master <3> Releases wait status <4> Wait timing when data wait status is set <5> Releases wait status again <6> Issues interrupt request when value of clock counter is 7 <7> Issues interrupt request when value of clock counter is 8 |
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