Renesas M16C 사용자 설명서

Rev.1.10    Jul 01, 2005    page 148 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

14. Serial I/O

This document is under development and its contents are subject to change.

Table 14.7 lists the functions of the input/output pins during UART mode. Table 14.8 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 14.17 shows the typical transmit timings in UART mode. Figure 14.18 shows the typical receive

timing in UART mode.

i = 0 to 2

TXDi

(P6_3, P6_7, P7_0)

RXDi

(P6_2, P6_6, P7_1)

CLKi

(P6_1, P6_5, P7_2)

________ ________

CTSi/RTSi

(P6_0, P6_4, P7_3)

Pin Name

Function

Method of Selection

Serial Data Output

Serial Data Input

I/O Port

Transfer Clock Input

_______

CTS Input

________

RTS Output

I/O Port

(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

-: “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).

Bit set Value

Pin Function

U1C0 Register

UCON Register

PD6 Register

CRD bit

CRS bit

RCSP bit

CLKMD1 bit

PD6_4 bit

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