R8CSLASH20 datasheet(337/501 Pages) RENESAS

337 / 501 page

R8C/20 Group, R8C/21 Group

16. Clock Synchronous Serial Interface

Rev.2.00 Aug 27, 2008

Page 321 of 458

REJ09B0250-0200

Figure 16.30

Registers ICDRR and ICDRS

Figure 16.31

PMR Register

IIC Bus Receive Data Register

Symbol

Address

After Reset

ICDRR

00BFh

FFh

Store receive data

When the ICDRS register receives 1-byte data, the receive data is transferred to the ICDRR

Function

IIC Bus Shift Register

Symbol

ICDRS

This register is a register that is used to transmit and receive data.

The transmit data is transferred from the ICDRT to ICDRS registers and data is transmitted

from the SDA pin w hen transmitting.

When 1-byte data is received, data is transferred from the ICDRS to ICDRR registers w hen

receiving.

—

Function

Port Mode Register

Symbol

Address

After Reset

PMR

00F8h

00h

Bit Symbol

Bit Name

Function

IICSEL

0 : SSU function selects

1 : I2C bus function selects

Set to 0

0 : I/O port P6_6, P6_7

1 : TXD1, RXD1

Set to 0

—

Reserved bits

SSU/I2C bus sw itch bit

—

Reserved bits

U1PINSEL

Port TXD1/RXD1 sw itch bit

—

(b3-b0)

—

(b6-b5)

b3 b2

b7 b6 b5 b4

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