Renesas M16C/62P Hardware Manual page 183

M16C/62P Group (M16C/62P, M16C/62PT)
17.1.1.3 LSB First/MSB First Select Function
Use the UFORM bit in the UiC0 register (i = 0 to 2) to select the transfer format. Figure 17.11 shows
the transfer format.
(1) When the UFORM bit in the UiC0 register = 0 (LSB first)
CLKi
TXDi
RXDi
(2) When the UFORM bit = 1 (MSB first)
CLKi
TXDi
RXDi
NOTES:
1. This applies to the case where the CKPOL bit in the UiC0 register = 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 17.11 Transfer Format
17.1.1.4 Continuous Receive Mode
In continuous receive mode, receive operation becomes enable when the receive buffer register is
read. It is not necessary to write dummy data into the transmit buffer register to enable receive
operation in this mode. However, a dummy read of the receive buffer register is required when start-
ing the operation mode.
When the UiRRM bit (i = 0 to 2) = 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 = 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.
R e . v 2 3 . 0 S e p 0 , 1 2 0 0 4
R E J 0 9 B 0 1 8 5 0 - 2 3 0 Z
D0 D1 D2 D3
D1 D2 D3
D0
D7
D6 D5 D4
D7 D6 D5 D4
page 169
f o 3 6 4
D4 D5 D6 D7
D4 D5 D6 D7
D3 D2 D1 D0
D3 D2 D1 D0
17. Serial I/O