M16C/62 Group DATASHEET

Clock synchronous serial I/O modeMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER(a) Polarity select functionAs shown in Figure 1.19.11, the CLK polarity select bit (bit 6 at addresses 03A416, 03AC16, 037C16)allows selection of the polarity of the transfer clock.• When CLK polarity select bit = “0”CLKiTXDiD0D1 D2 D3 D4 D5 D6 D7Note 1: The CLK pin level when nottransferring data is “H”.RXDiD0D1 D2 D3 D4 D5 D6 D7• When CLK polarity select bit = “1”CLKiTXDiD0D1 D2 D3 D4 D5 D6 D7Note 2: The CLK pin level when nottransferring data is “L”.RXDiD0D1 D2 D3 D4 D5 D6 D7Figure 1.19.11. Polarity of transfer clock(b) LSB first/MSB first select functionAs shown in Figure 1.19.12, 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”.• When transfer format select bit = “0”CLKiTXDiD0D1 D2 D3 D4 D5 D6 D7LSB firstRXDiD0D1 D2 D3 D4 D5 D6 D7• When transfer format select bit = “1”CLKiTXDiRXDiD7D6 D5 D4 D3 D2 D1 D0D7 D6 D5 D4 D3 D2 D1 D0MSB firstNote: This applies when the CLK polarity select bit = “0”.Figure 1.19.12. Transfer format126