M16CSLASH26 datasheet(131/239 Pages) RENESAS

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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 .

TXDi

RXDi

CLKi

1. When CLK polarity select bit = 0

Note 1: The CLKi pin level when not

transferring data is H .

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

TXDi

RXDi

CLKi

2. 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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