R8CSLASH15 datasheet(145/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

14. Serial Interface

Rev.2.10

Jan 19, 2006

Page 133 of 253

REJ09B0164-0210

14.1.1

Polarity Select Function

Figure 14.7 shows the Transfer Clock Polarity. Use the CKPOL bit in the U0C0 register to select the

transfer clock polarity.

Figure 14.7

Transfer Clock Polarity

14.1.2

LSB First/MSB First Select Function

Figure 14.8 shows the Transfer Format. Use the UFORM bit in the U0C0 register to select the

transfer format.

Figure 14.8

Transfer Format

CLK0(1)

TXD0

• When the CKPOL bit in the U0C0 register = 0 (output transmit data at the falling

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

NOTES :

1. When not transferring, the CLK0 pin level is “H”.

2. When not transferring, the CLK0 pin level is “L”.

RXD0

CLK0(2)

TXD0

RXD0

• When the CKPOL bit in the U0C0 register = 1 (output transmit data at the rising

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

CLK0

TXD0

• When UFORM bit in U0C0 register = 0 (LSB first)(1)

RXD0

CLK0

TXD0

RXD0

• When UFORM bit in U0C0 register = 1 (MSB first)(1)

NOTES :

1. The above applies when the CKPOL bit in the U0C0 register is

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

data at the rising edge of the transfer clock).

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