R8C2K datasheet(342/471 Pages) RENESAS

342 / 471 page

R8C/2K Group, R8C/2L Group

17. Serial Interface

Rev.1.10

Dec 21, 2007

Page 325 of 450

REJ09B0406-0110

17.1.1

Polarity Select Function

Figure 17.8 shows the Transfer Clock Polarity. Use the CKPOL bit in the UiC0 (i = 0 or 2) register to select the

transfer clock polarity.

Figure 17.8

Transfer Clock Polarity

17.1.2

LSB First/MSB First Select Function

Figure 17.9 shows the Transfer Format. Use the UFORM bit in the UiC0 (i = 0 or 2) register to select the

transfer format.

Figure 17.9

Transfer Format

CLKi(1)

TXDi

• When the CKPOL bit in the UiC0 register = 0 (output transmit data at the falling

edge and input receive data at the rising edge of the transfer clock)

NOTES:

1. When not transferring, the CLKi pin level is “H”.

2. When not transferring, the CLKi pin level is “L”.

RXDi

CLKi(2)

TXDi

RXDi

• When the CKPOL bit in the UiC0 register = 1 (output transmit data at the rising

edge and input receive data at the falling edge of the transfer clock)

i = 0 or 2

CLKi

TXDi

• When UFORM bit in UiC0 register = 0 (LSB first)(1)

RXDi

CLKi

TXDi

RXDi

• When UFORM bit in UiC0 register = 1 (MSB first)(1)

NOTE:

1. The above applies when the CKPOL bit in the UiC0 register is

set to 0 (output transmit data at the falling edge and input receive

data at the rising edge of the transfer clock).

i = 0 or 2

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