32186 datasheet(567/1032 Pages) RENESAS

567 / 1032 page

SERIAL INTERFACE

12-19

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

12.2.4 SIO Transmit Buffer Registers

SIO0 Transmit Buffer Register (S0TXB)

<Address: H'0080 0112>

SIO1 Transmit Buffer Register (S1TXB)

<Address: H'0080 0122>

SIO2 Transmit Buffer Register (S2TXB)

<Address: H'0080 0132>

SIO3 Transmit Buffer Register (S3TXB)

<Address: H'0080 0142>

SIO4 Transmit Buffer Register (S4TXB)

<Address: H'0080 0A12>

SIO5 Transmit Buffer Register (S5TXB)

<Address: H'0080 0A22>

b15

TDATA

????????????????

Bit Name

Function

0–15

TDATA

Transmit data is set in these bits.

Transmit data

The SIO Transmit Buffer Registers are used to set transmit data. The write value of these registers can be

read out. Data must be LSB-aligned when write a transmit data. According to the conditions of the serial

interface mode select bit, the CSIO bit length select bit and the transfer order select bit, the data corre-

sponding to the specified bit is transmitted from the LSB or MSB side.

Before setting transmit data in these registers, enable the Transmit Control Register TEN (Transmit En-

able) bit by setting it to "1." Writing data to these registers while the TEN bit is disabled (cleared to "0") has

no effect.

When data is written to the SIO Transmit Buffer Register while transmission is enabled, the data is transferred

from that register to the SIO Transmit Shift Register, upon which the serial interface starts sending data.

Note: • For the 7-bit and 8-bit data formats, the register can be accessed bytewise.

12.2 Serial Interface Related Registers

32186 Datasheet(PDF) 567 Page - Renesas Technology Corp