M16C6S_09 Datasheet, PDF (111/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
UART Mode
Table 1.15.3 lists the functions of the input/output pins during UART mode. Table 1.15.4 lists the P64 pin
functions during UART mode. Note that for a period from when the UARTi operation mode is selected to
when transfer starts, the TxDi pin outputs an “H”. (If the N-channel open-drain output is selected, this pin
is in a high-impedance state.)
Table 1.15.3. I/O Pin Functions
Pin name
Function
TxDi (i = 0 to 2) _{Serial data output}
(P63, P67, P70)
RxDi
Serial data input
(P62, P66, P71)
CLKi
(P61, P65)
Input/output port
Transfer clock input
CTSi/RTSi
CTS input
(P60, P64, P73)
RTS output
Input/output port
Method of selection
(Outputs dummy data when performing reception only)
PD6 register’s PD6_2 bit=0, PD6_6 bit=0, PD7 register’s PD7_1 bit=0
(Can be used as an input port when performing transmission only)
UiMR register’s CKDIR bit=0
UiMR register’s CKDIR bit=1
PD6 register’s PD6_1 bit=0, PD6_5 bit=0, PD7 register’s PD7_2 bit=0
UiC0 register’s CRD bit=0
UiC0 register’s CRS bit=0
PD6 register’s PD6_0 bit=0, PD6_4 bit=0, PD7 register’s PD7_3 bit=0
UiC0 register’s CRD bit=0
UiC0 register’s CRS bit=1
UiC0 register’s CRD bit=1
Table 1.15.4. P64 Pin Functions
Pin function
P64
CTS1
RTS1
CTS0 (Note)
U1C0 register
CRD CRS
1
0
0
0
1
0
0
Bit set value
UCON register
RCSP CLKMD1
0
0
0
0
0
0
1
0
PD6 register
PD6_4
Input: 0, Output: 1
0
0
Note: In addition to this, set the U0C0 register’s CRD bit to “0” (CTS0/RTS0
enabled) and the U0C0 register’s CRS bit to “1” (RTS0 selected).
Rev.5.01 Dec 10, 2009 page 111 of 201
REJ03B0014-0501