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38C3 Datasheet(PDF) 108 Page - Renesas Technology Corp |
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38C3 Datasheet(HTML) 108 Page - Renesas Technology Corp |
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108 / 224 page  38C3 Group User’s Manual APPLICATION 2-43 2.3 Serial I/O (2) Output of serial data (control of peripheral IC) Outline : Serial communication is performed, connecting port P57 with the CS pin of a peripheral IC. Figure 2.3.15 shows a connection diagram, and Figure 2.3.16 shows a timing chart. Fig. 2.3.15 Connection diagram Specifications : • Use of serial I/O in clock synchronous serial I/O • Synchronous clock frequency : 125 kHz (f(XIN) = 4 MHz is divided by 32) • Transfer direction : LSB first • Not use of serial I/O interrupt • Port P57 is connected with the CS pin (“L” active) of the peripheral IC for transmission control; the output level of port P57 is controlled by software. Fig. 2.3.16 Timing chart P57 SCLK1 SOUT 38C3 groupPeripheral IC CS CLK DATA CS CLK DATA CS CLK DATA DO0 DO1 DO2 DO3 |
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