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7643 Datasheet(PDF) 150 Page - Renesas Technology Corp |
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7643 Datasheet(HTML) 150 Page - Renesas Technology Corp |
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150 / 424 page  Rev.2.00 Aug 28, 2006 page 29 of 202 7643 Group REJ09B0133-0200 APPLICATION 2.3 Serial I/O 2.3.4 Serial I/O application example (1) Output of serial data (control of peripheral IC) Outline : Serial communication is performed, connecting port to CS pin of peripheral IC. To perform reception, it needs to write dummy data into serial I/O shift register. Figure 2.3.9 shows a connection diagram, and Figure 2.3.10 shows a timing chart. Fig. 2.3.9 Connection diagram Specifications : • Synchronous clock frequency : 187.5 kHz (f(XIN) = 24 MHz ) • Transfer direction : LSB first • Serial I/O interrupt is not used. • Port P31 is connected to the CS pin (“L” active) of the peripheral IC for transmission control; the output level of port P31 is controlled by software. Fig. 2.3.10 Timing chart P31 P81/SCLK P83/STXD 7643 group Peripheral IC CS CLK DATA CS CLK DATA CS CLK DATA DATA0 DATA1 DATA2 DATA3 |
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