M16C30P_07 Datasheet, PDF (156/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
15. Serial Interface
Table 15.7 lists the functions of the input/output pins during UART mode. Table 15.8 lists the P6_4 Pin
Functions. 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 15.7 I/O Pin Functions
Pin Name
TXDi (i = 0 to 2)
(P6_3, P6_7,
P7_0)
Function
Method of Selection
Serial Data Output (“H” outputs when performing reception only)
RXDi
(P6_2, P6_6,
P7_1)
Serial Data Input
PD6_2 bit and PD6_6 bit in the PD6 register = 0, PD7_1 bit in the
PD7 register = 0
(Can be used as an input port when performing transmission only)
CLKi
(P6_1, P6_5,
P7_2)
CTSi/RTSi
(P6_0, P6_4,
P7_3)
Input/Output Port
Transfer Clock
Input
CTS Input
RTS Output
CKDIR bit in the UiMR register = 0
CKDIR bit = 1
PD6_1 bit and PD6_5 bit in the PD6 register = 0, PD7_2 bit in the
PD7 register = 0
CRD bit in the UiC0 register = 0
CRS bit in the UiC0 register = 0
PD6_0 bit and PD6_4 bit in the PD6 register = 0, PD7_3 bit in the
PD7 register = 0
CRD bit = 0
CRS bit = 1
Input/Output Port CRD bit = 1
Table 15.8 P6_4 Pin Functions
Pin Function
P6_4
CTS1
RTS1
CTS0 ⁽¹⁾
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
− : “0” or “1”
NOTES:
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).
Rev.1.22 Mar 29, 2007 Page 140 of 291
REJ09B0179-0122