Renesas 6NM User Manual

Rev.1.10    Jul 01, 2005    page 137 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.

b7

b6

b5

b4

b3

b2

b1

b0

Function

UARTi Special Mode Register 4 (i = 0 to 2)

Bit Name

Bit

Symbol

Symbol

Address

After Reset

U0SMR4 to U2SMR4

01ECh, 01F0h, 01F4h

 00h

RW

STAREQ

RSTAREQ

STPREQ

Restart Condition
Generate Bit 

(1)

 

Stop Condition
Generate Bit 

(1)

Start Condition
Generate Bit 

(1)

STSPSEL

SCL,SDA Output
Select Bit

0 : Clear
1 : Start
0 : Clear
1 : Start 

0 : Clear
1 : Start

0 : Start and stop conditions not output
1 : Start and stop conditions output

RW

RW

RW

RW

SCL Wait Bit 3

SWC9

0 : SCL "L" hold disabled
1 : SCL "L" hold enabled

RW

SCL Output Stop
Enable Bit

SCLHI

0 : Disabled
1 : Enabled

RW

ACK Data Output
Enable Bit

ACKC

0 : Serial I/O data output
1 : ACK data output

RW

ACK Data Bit

ACKD

0 : ACK
1 : NACK

RW

NOTE:

1. Set to "0" when each condition is generated.