M16C6NK Datasheet, PDF (187/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
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 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”.
Figure 15.17 shows the typical transmit timings in UART mode. Figure 15.18 shows the typical receive
timing in UART mode.
Table 15.7 I/O Pin Functions
Pin Name
Function
TXDi
Serial Data Output
(P6_3, P6_7, P7_0)
RXDi
Serial Data Input
(P6_2, P6_6, P7_1)
CLKi
I/O Port
(P6_1, P6_5, P7_2) Transfer Clock Input
________ ________
CTSi/RTSi
_______
CTS Input
(P6_0, P6_4, P7_3)
i = 0 to 2
________
RTS Output
I/O Port
Method of Selection
(Outputs “H” when performing reception only)
PD6_2 and PD6_6 bits in PD6 register = 0
PD7_1 bit in PD7 register = 0
(Can be used as an input port when performing transmission only)
CKDIR bit in UiMR register = 0
CKDIR bit in UiMR register = 1
PD6_1 and PD6_5 bits in PD6 register = 0
PD7_2 bit in PD7 register = 0
CRD bit in UiC0 register = 0
CRS bit in UiC0 register = 0
PD6_0 and PD6_4 bits in PD6 register = 0
PD7_3 bit in PD7 register = 0
CRD bit = 0
CRS bit = 1
CRD bit = 1
Table 15.8 P6_4 Pin Functions
Bit set Value
Pin Function
U1C0 Register
UCON Register
PD6 Register
CRD bit CRS bit RCSP bit CLKMD1 bit
PD6_4 bit
P6_4
_________
CTS1
_________
RTS1
_________
CTS0 ⁽¹⁾
1
-
0
0
0
0
0
0
0
1
0
0
0
0
1
0
Input: 0, Output: 1
0
-
0
-: “0” or “1”
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).
Rev.2.00 Nov 28, 2005 page 169 of 378
REJ09B0124-0200