M32C8A Datasheet, PDF (230/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
17. Serial Interfaces
17.1.1.2 LSB First or MSB First
As shown in figure 17.15, the UFORM bit in the UiC0 register (i = 0 to 4) determines a bit order.
(1) When the UFORM bit in the UiC0 register (i = 0 to 4) is set to 0 (LSB first)
"H"
CLKi
"L"
"H"
TXDi
"L"
D0
D1
D2
D3
D4
D5
D6
D7
"H"
RXDi
"L"
D0
D1
D2
D3
D4
D5
D6
D7
(2) When the UFORM bit is set to 1 (MSB first)
"H"
CLKi
"L"
"H"
TXDi
"L"
D7
D6
D5
D4
D3
D2
D1
D0
"H"
RXDi
"L"
D7
D6
D5
D4
D3
D2
D1
D0
The above applies under the following conditions:
- CKPOL bit in the UiC0 register is set to 0 (transmit data is output at the falling edge and received data is input at the rising edge)
- UiLCH bit in the UiC1 register is set to 0 (not inverted).
Figure 17.15 Bit Order (8-Bit Data Length)
Rev.1.00 Jul 15, 2007 Page 213 of 352
REJ09B0385-0100