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M16C/29 Group
Table 14.1.2.3 lists the functions of the input/output pins during UART mode. Table 14.1.2.4 lists the P6
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 14.1.2.3. I/O Pin Functions in UART mode
Pin name
TxDi (i = 0 to 2)
Serial data output
(P6
, P6
, P7
)
3
7
0
Serial data input
RxDi
(P6
, P6
, P7
)
2
6
1
CLKi
Input/output port
(P6
, P6
, P7
)
1
5
2
Transfer clock input
CTSi/RTSi
CTS input
(P6
, P6
, P7
)
0
4
3
RTS output
Input/output port
Table 14.1.2.4. P6
4
Pin function
P6
4
CTS
1
RTS
1
CTS
(Note)
0
Note: In addition to this, set the U0C0 register's CRD bit to "0" (CTS
enabled) and the U0C0 register's CRS bit to "1" (RTS
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Function
(Outputs "H" 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/output 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
Pin Functions in UART mode
Bit set value
U1C0 register
UCON register
CRS
RCSP
CRD
1
0
0
0
0
0
1
0
0
0
1
page 182 of 402
Method of selection
PD6 register
CLKMD1
PD6_4
0
Input: 0, Output: 1
0
0
0
0
0
/RTS
0
selected).
0
14.1 UARTi (i=0 to 2)
0
4
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