Lsb First Or Msb First Selection - Renesas M16C/64A Series User Manual

M16C/64A Group
24.3.3

LSB First or MSB First Selection

Bit order is selected by setting the SMi5 bit in the SiC register (i = 3, 4). Figure 24.3 shows Bit Order.
(1) The SMi5 bit in the SiC register is set to 0 (LSB first)
CLKi
TXDi
RXDi
(2) The SMi5 bit in the SiC register is set to 1 (MSB first)
CLKi
TXDi
RXDi
The above diagram assumes the following:
The SMi4 bit in the SiC register is set to 0 (transmit data is output at falling edge of transmit/receive
clock and receive data is input at rising edge)
i = 3, 4
Figure 24.3 Bit Order
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
D0 D1 D2 D3
D0 D1 D2 D3
D7 D6 D5 D4
D7 D6 D5 D4
24. Serial Interface SI/O3 and SI/O4
D4 D5 D6 D7
D4 D5 D6 D7
D3 D2 D1 D0
D3 D2 D1 D0
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