HD6432138SW datasheet(523/1061 Pages) RENESAS

523 / 1061 page

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 469 of 1004

REJ09B0301-0400

Bit 7

ICE

Description

2C bus interface module disabled, with SCL and SDA signal pins set to port function

(Initial value)

Internal state initialization of I

2C bus interface module

SAR and SARX can be accessed

2C bus interface module enabled for transfer operations (pins SCL and SCA are

driving the bus)

ICMR and ICDR can be accessed

Bit 6—I

2C Bus Interface Interrupt Enable (IEIC): Enables or disables interrupts from the I2C

bus interface to the CPU.

Bit 6

IEIC

Description

Interrupts disabled

(Initial value)

Interrupts enabled

Bit 5—Master/Slave Select (MST)

Bit 4—Transmit/Receive Select (TRS)

MST selects whether the I

2C bus interface operates in master mode or slave mode.

TRS selects whether the I

2C bus interface operates in transmit mode or receive mode.

In master mode with the I

2C bus format, when arbitration is lost, MST and TRS are both reset by

hardware, causing a transition to slave receive mode. In slave receive mode with the addressing

format (FS = 0 or FSX = 0), hardware automatically selects transmit or receive mode according to

the R/

W bit in the first frame after a start condition.

Modification of the TRS bit during transfer is deferred until transfer of the frame containing the

acknowledge bit is completed, and the changeover is made after completion of the transfer.

MST and TRS select the operating mode as follows.

HD6432138SW Datasheet(PDF) 523 Page - Renesas Technology Corp