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R01UH0092EJ0110 Rev.1.10
Page 527 of 807
Jul 31, 2012
M16C/64C Group
24. Serial Interface SI/O3 and SI/O4
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.
Figure 24.3
Bit Order
(1) The SMi5 bit in the SiC register is set to 0 (LSB first)
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
D0
TXDi
RXDi
CLKi
(2) The SMi5 bit in the SiC register is set to 1 (MSB first)
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
D7
TXDi
RXDi
CLKi
The above diagram assumes the following:
y
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
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