R8CSLASH15 datasheet(148/277 Pages) RENESAS

148 / 277 page

R8C/14 Group, R8C/15 Group

14. Serial Interface

Rev.2.10

Jan 19, 2006

Page 136 of 253

REJ09B0164-0210

NOTES:

1. The bits used for transmit/receive data are as follows: Bits 0 to 6 when transfer data is 7-bit long; bits

0 to 7 when transfer data is 8-bit long; bits 0 to 8 when transfer data is 9-bit long.

Table 14.6 lists the I/O Pin Functions in Clock Asynchronous Serial I/O Mode. After the UART0 operating

mode is selected, the TXD0 pin outputs “H” level (If the NCH bit is set to “1” (N-channel open-drain

outputs), this pin is in a high-impedance state) until transfer starts.

Table 14.5

Registers to Be Used and Settings in UART Mode

Bit

Function

U0TB

0 to 8

Set transmit data(1)

U0RB

0 to 8

Receive data can be read(1)

OER,FER,PER,SUM

Error flag

U0BRG

0 to 7

Set a bit rate

U0MR

SMD2 to SMD0

Set to “100b” when transfer data is 7-bit long

Set to “101b” when transfer data is 8-bit long

Set to “110b” when transfer data is 9-bit long

CKDIR

Select the internal clock or external clock

STPS

Select the stop bit

PRY, PRYE

Select whether parity is included and odd or even

U0C0

CLK0, CLK1

Select the count source for the U0BRG register

TXEPT

Transmit register empty flag

NCH

Select TXD0 pin output mode

CKPOL

Set to “0”

UFORM

LSB first or MSB first can be selected when transfer data is 8-bit

long. Set to “0” when transfer data is 7- or 9-bit long.

U0C1

Set to “1” to enable transmit

Transmit buffer empty flag

Set to “1” to enable receive

Receive complete flag

UCON

U0IRS, U1IRS

Select the factor of UART0 transmit interrupt

U0RRM

Set to “0”

CNTRSEL

Set to “1” to select P1_5/RXD0/CNTR01/INT11

Table 14.6

I/O Pin Functions in Clock Asynchronous Serial I/O Mode

Pin name

Function

Selection Method

TXD0(P1_4)

Output serial data

(Cannot be used as a port when performing receive only)

RXD0(P1_5)

Input serial data

PD1_5 bit in PD1 register=0

(P1_5 can be used as an input port when performing transmit

only)

CLK0(P1_6)

Programmable I/O Port CKDIR bit in U0MR register=0

Input transfer clock

CKDIR bit in U0MR register=1

PD1_6 bit in PD1 register=0

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