M32CSLASH8A datasheet(229/372 Pages) RENESAS

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M32C/8A Group

17. Serial Interfaces

Rev.1.00

Jul 15, 2007

Page 212 of 352

REJ09B0385-0100

17.1.1.1 CLK Polarity

As shown in figure 17.14, the CKPOL bit in the UiC0 register (i = 0 to 4) determines the polarity of the serial

clock.

Figure 17.14

Serial Clock Polarity

CLKi

(1) When the CKPOL bit in the UiC0 register (i = 0 to 4) is set to 0 (transmit data output at the

falling edge and receive data input at the rising edge of the serial clock )

(2) When the CKPOL bit is set to 1 (transmit data output at the rising edge and receive data input

at the falling edge of the serial clock)

TXDi

RXDi

The above applies under the following conditions:

- UFORM bit in the UiC0 register is set to 0 (LSB first)

- UiLCH bit in the UiC1 register is set to 0 (not inverted).

NOTES:

1. The CLKi pin output level is "H" when no transmit and receive operation is in progress.

2. The CLKi pin output level is "L" when no transmit and receive operation is in progress.

"H"

"L"

"H"

"L"

"H"

"L"

CLKi

TXDi

RXDi

"H"

"L"

"H"

"L"

"H"

"L"

(note 1)

(note 2)

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