M16C26A Datasheet, PDF (164/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
13. Serial I/O
13.1.1.3 LSB First/MSB First Select Function
Use the UFORM bit in the UiC0 register (i = 0 to 2) to select the transfer format. Figure 13.1.1.3.1
shows the transfer format.
(1) When the UFORM bit in the UiC0 register "0" (LSB first)
CLKi
TXDi
D0 D1 D2 D3 D4 D5 D6 D7
RXDi
D0 D1 D2 D3 D4 D5 D6 D7
(2) When the UFORM bit in the UiC0 register is set to "1" (MSB first)
CLKi
TXDi
D7 D6 D5 D4 D3 D2 D1 D0
RXDi
D7 D6 D5 D4 D3 D2 D1 D0
NOTE:
1. This applies to the case where the CKPOL bit in the UiC0 register is set to "0" (transmit
data output at the falling edge and the receive data taken in at the rising edge of the
transfer clock) and the UiLCH bit in the UiC1 register "0" (no reverse).
i = 0 to 2
Figure 13.1.1.3.1 Transfer format
13.1.1.4 Continuous receive mode
When the UiRRM bit (i = 0 to 2) is set to "1" (continuous receive mode), the TI bit in the UiC1 register
is set to “0” (data present in the UiTB register) by reading the UiRB register. In this case, i.e., UiRRM
bit is set to "1", do not write dummy data to the UiTB register in a program. The U0RRM and U1RRM
bits are the bit 2 and bit 3 in the UCON register, respectively, and the U2RRM bit is the bit 5 in the
U2C1 register.
Rev. 2.00 Feb.15, 2007 ^{page 147} of 329
REJ09B0202-0200