M30620FCAFP datasheet(142/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Clock synchronous serial I/O mode

1-123

(a) Polarity select function

As shown in Figure 1.16.12, 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 = “1”

Note 2: The CLKi pin level when not

transferring data is “L”.

TXDi

RXDi

CLKi

• When CLK polarity select bit = “0”

Note 1: The CLKi pin level when not

transferring data is “H”.

TXDi

RXDi

CLKi

Figure 1.16.12. Polarity of transfer clock

(b) LSB first/MSB first select function

As shown in Figure 1.16.13, 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 1.16.13. Transfer format

LSB first

• When transfer format select bit = “0”

TXDi

RXDi

CLKi

• When transfer format select bit = “1”

TXDi

RXDi

CLKi

MSB first

Note: This applies when the CLK polarity select bit = “0”.

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