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3819 Datasheet(PDF) 108 Page - Renesas Technology Corp |
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3819 Datasheet(HTML) 108 Page - Renesas Technology Corp |
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108 / 218 page  94 2. APPLICATION MITSUBISHI MICROCOMPUTER 3819 Group 2.3 Serial I/O 3819 Group USER’S MANUAL 2.3.4 Serial I/O application examples (1) Output of serial data (control of a peripheral IC) Outline : The port is connected to the CS pin of a peripheral IC and the serial transmission is controlled. Fig. 2.3.13 Connection diagram [Output of serial data] Specifications : • The Serial I/O 1 is used (the automatic transfer function is not used) • Synchronous clock frequency: 131 kHz ( f(XIN) = 4.19 MHz is divided by 32) • Transmission direction: LSB first • The Serial I/O 1 interrupt is not used. • The Port P67 is connected to the CS pin (“L” active) of the peripheral IC for a transmission control (the output level of the port P67 is controlled by software). Figre 2.3.14 shows an output timing chart of serial data. Fig. 2.3.14 Timing chart [Output of serial data] P67 P66/SCLK11 P65/SOUT1 3819 group CS CLK DATA Peripheral IC CS CLK DATA CS CLK DATA DO0 DO1 DO2 DO3 |
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