M16C65 Datasheet, PDF (553/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
23. Serial Interface UARTi (i = 0 to 2, 5 to 7)
Table 23.10 lists I/O Pin Functions in UART Mode. Table 23.11 lists the P6_4 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 is in
high-impedance state.)
Table 23.10 I/O Pin Functions in UART Mode
Pin Name
TXDi
RXDi
I/O
Output
Input
Input
Function
Serial data output
Serial data input
Input port
CLKi
Input/
output
Input
CTSi/RTSi Input
Input/output port
Transmit/receive
clock input
CTS input
Output RTS output
Input/
output
i = 0 to 2, 5 to 7
I/O port
Method of Selection
(High-level output when performing reception only.)
Set the port direction bits sharing pins to 0.
Set the port direction bits sharing pins to 0. (can be used as
an input port when performing transmission only)
The CKDIR bit in the UiMR register = 0
The CKDIR bit in the UiMR register = 1
Set the port direction bits sharing pins to 0.
The CRD bit in the UiC0 register = 0
The CRS bit in the UiC0 register = 0
Set the port direction bits sharing pins to 0.
The CRD bit in the UiC0 register = 0
The CRS bit in the UiC0 register = 1
The CRD bit in the UiC0 register = 1
Table 23.11 P6_4 Pin Functions in UART Mode
Bit Set Value
Pin Function
U1C0 Register
UCON Register
PD6 Register
CRD
CRS
RCSP
CLKMD1
PD6_4
P6_4
1
-
0
0
Input: 0, Output: 1
CTS1
0
0
0
0
0
RTS1
0
1
0
0
-
CTS0 ⁽¹⁾
0
0
1
0
0
− indicates either 0 or1.
Note:
1. In addition to this, set the CRD bit in the U0C0 register to 0 (CTS0/RTS0 enabled) and the CRS
bit in the U0C0 register to 1 (RTS0 selected).
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 518 of 791