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M16C/26 Datasheet(PDF) 131 Page - Renesas Technology Corp |
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M16C/26 Datasheet(HTML) 131 Page - Renesas Technology Corp |
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131 / 239 page  Clock Synchronous Serial I/O Mode 125 Renesas Technology Corp. M16C/26 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Under development Preliminary Specifications Rev. 0.9 Specifications in this manual are tentative and subject to change. (a) Polarity select function As shown in Figure 1.15.13, the CLK polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16) allows selection of the polarity of the transfer clock. 2. When CLK polarity select bit = 1 Note 2: The CLKi pin level when not transferring data is L . D1 D2 D3 D4 D5 D6 D7 D1 D2 D3 D4 D5 D6 D7 D0 D0 TXDi RXDi CLKi 1. When CLK polarity select bit = 0 Note 1: The CLKi pin level when not transferring data is H . D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 TXDi RXDi CLKi Figure 1.15.13. Polarity of transfer clock (b) LSB first/MSB first select function As shown in Figure 1.15.14, when the transfer format select bit (bit 7 at addresses 03A416, 03AC16, 037C16) = “0”, the transfer format is “LSB first”; when the bit = “1”, the transfer format is “MSB first”. Figure 1.15.14. Transfer format LSB first 1. When transfer format select bit = 0 D0 D0 D1 D2 D3 D4 D5 D6 D7 D1 D2 D3 D4 D5 D6 D7 TXDi RXDi CLKi 2. When transfer format select bit = 1 D6 D5 D4 D3 D2 D1 D0 D7 D7 D6 D5 D4 D3 D2 D1 D0 TXDi RXDi CLKi MSB first Note: This applies when the CLK polarity select bit = 0 . |
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