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M16C/5L Group, M16C/56 Group
Table 21.9 lists I/O Pin Functions in UART Mode. Note that for a period from when the UARTi operating
mode is selected to when transmission starts, the TXDi pin outputs a high-level signal. (If N-channel
open drain output is selected, this pin becomes high-impedance.)
Table 21.9
I/O Pin Functions in UART Mode
Pin Name
I/O
TXDi
Output
RXDi
Input
I/O
CLKi
Input
Input
CTSi / RTSi
(1)
Output
I/O
i = 0 to 4
Note:
The CTS / RTS pin is not available for UART4.
1.
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
Function
Serial data output
(High-level output only when receiving.)
Serial data input
Set the port direction bit sharing pin to 0.
Input/output port
The CKDIR bit in the UiMR register = 0
Transmit/receive
The CKDIR bit in the UiMR register = 1
clock input
Set the port direction bit sharing pin to 0.
The CRD bit in the UiC0 register = 0
CTS input
The CRS bit in the UiC0 register = 0
Set the port direction bit sharing pin to 0.
The CRD bit in the UiC0 register = 0
RTS output
The CRS bit in the UiC0 register = 1
I/O port
The CRD bit in the UiC0 register = 1
21. Serial Interface UARTi (i = 0 to 4)
Method of Selection
Page 459 of 803
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