Renesas 16-bit single-chip microcomputer 사용자 설명서

Rev.1.02    Jul 01, 2005    page 135 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

14. Serial I/O

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

Register

            Bit

                        Function

UiTB 

(1)

0 to 7

Set transmission data

UiRB 

(1)

0 to 7

Reception data can be read

OER

Overrun error flag

UiBRG

0 to 7

Set a transfer rate

UiMR 

(1)

SMD2 to SMD0

Set to “001b”

CKDIR

Select the internal clock or external clock

IOPOL

Set to “0”

UiC0

CLK1 to CLK0

Select the count source for the UiBRG register

CRS

_______

_______

Select CTS or RTS to use

TXEPT

Transmit register empty flag

CRD

_______

_______

Enable or disable the CTS or RTS function

NCH

Select TXDi pin output mode

CKPOL

Select the transfer clock polarity

UFORM

Select the LSB first or MSB first

UiC1

TE

Set this bit to “1” to enable transmission/reception

TI

Transmit buffer empty flag

RE

Set this bit to “1” to enable reception

RI

Reception complete flag

U2IRS 

(2)

Select the source of UART2 transmit interrupt

U2RRM 

(2)

Set this bit to “1” to use continuous receive mode

UiLCH

Set this bit to “1” to use inverted data logic

UiERE

Set to “0”

UiSMR

0 to 7

Set to “0”

UiSMR2

0 to 7

Set to “0”

UiSMR3

0 to 2

Set to “0”

NODC

Select clock output mode

4 to 7

Set to “0”

UiSMR4

0 to 7

Set to “0”

UCON

U0IRS, U1IRS

Select the source of UART0/UART1 transmit interrupt

U0RRM, U1RRM

Set this bit to “1” to use continuous receive mode

CLKMD0

Select the transfer clock output pin when the CLKMD1 bit = 1

CLKMD1

Set this bit to “1” to output UART1 transfer clock from two pins

RCSP

_________

Set this bit to “1” to accept as input the UART0 CTS0 signal from the P6_4 pin

7

Set to “0”

i = 0 to 2

NOTES:

1. Not all register bits are described above. Set those bits to “0” when writing to the registers in clock

synchronous serial I/O mode.

2. Set the bit 4 and bit 5 in the U0C1 and U1C1 registers to “0”. The U0IRS, U1IRS, U0RRM and

U1RRM bits are in the UCON register.