Datasheet

Section 15 I

C Bus Interface (IIC)

Rev. 6.00 Mar. 24, 2006 Page 243 of 412

REJ09B0142-0600

Bit Bit Name

Initial

Value R/W Description

3 ACKE 0 R/W Acknowledge Bit Judgement Selection

0: The value of the acknowledge bit is ignored, and

continuous transfer is performed. The value of the

received acknowledge bit is not indicated by the

ACKB bit, which is always 0.

1: If the acknowledge bit is 1, continuous transfer is

interrupted.

2 BBSY 0 R/W Bus Busy

In slave mode, reading the BBSY flag enables to

confirm whether the I

C bus is occupied or released.

The BBSY flag is set to 0 when the SDA level changes

from high to low under the condition of SCl = high,

assuming that the start condition has been issued. The

BBSY flag is cleared to 0 when the SDA level changes

from low to high under the condition of SCl = high,

assuming that the start condition has been issued.

Writing to the BBSY flag in slave mode is disabled.

In master mode, the BBSY flag is used to issue start

and stop conditions. Write 1 to BBSY and 0 to SCP to

issue a start condition. Follow this procedure when also

re-transmitting a start condition. To issue a start/stop

condition, use the MOV instruction. The I

C bus

interface must be set in master transmit mode before

the issue of a start condition.