Datasheet

M16C/6S Group UART Mode
R01DS0201EJ0502 Rev.5.02 page 114 of 203
Dec 25, 2012
(a) LSB First/MSB First Select Function
As shown in Figure 1.15.3, use the UiC0 register’s UFORM bit to select the transfer format. This
function is valid when transfer data is 8 bits long.
Figure 1.15.3. Transfer Format
(1) When UiC0 register's UFORM bit = 0 (LSB first)
(2) When UiC0 register's UFORM bit = 1 (MSB first)
Note: This applies to the case where the UiC0 register’s CKPOL bit = 0 (
transmit data output at the falling edge and the receive data taken
in at the rising edge of the transfer clock), the UiC1 register’s UiLCH
bit = 0 (no reverse), UiMR register's STPS bit = 0 (1 stop bit) and
UiMR register's PRYE bit = 1 (parity enabled).
D 1 D2 D3 D4 D5 D6 SPD0
D1 D2 D3 D4 D5 D6 SPD0
TXDi
RXDi
CLKi
D6 D5 D4 D3 D2 D1 D0
D7
TXDi
RXDi
CLKi
ST
ST
D7 P
D7 P
SP
SP
ST
ST
P
P
D6 D5 D4 D3 D2 D1 D0
D7
ST : Start bit
P : Parity bit
SP : Stop bit
i = 0 to 2
Counter Measure for Communication Error Occurs
If a communication error occurs while transmitting or receiving in UART mode, follow the procedures
below.
• Resetting the UiRB register (i=0 to 2)
(1) Set the RE bit in the UiC1 register to “0” (reception disabled)
(2) Set the RE bit in the UiC1 register to “1” (reception enabled)
• Resetting the UiTB register (i=0 to 2)
(1) Set the SMD2 to SMD0 bits in the UiMR register “000b” (Serial I/O disabled)
(2) Set the SMD2 to SMD0 bits in the UiMR register “001b”, “101b”, “110b”.
(3) “1” is written to RE bit in the UiC1 register (reception enabled), regardless of the TE bit in the UiCi
register