H8SXSLASH1663 datasheet(882/1158 Pages) RENESAS

882 / 1158 page

Section 17 I

2C Bus Interface 2 (IIC2)

Rev.1.00 Jun. 07, 2006 Page 830 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description

R/W

Arbitration Lost Flag

This flag indicates that arbitration was lost in master

mode.

When two or more master devices attempt to seize the

bus at nearly the same time, the I

2C bus monitors SDA,

and if the I

2C bus interface detects data differing from

the data it sent, it sets AL to 1 to indicate that the bus

has been taken by another master.

[Setting conditions]

• When the internal SDA and the SDA pin level

disagree at the rising of SCL in master transmit

mode

• When the SDA pin outputs a high level in master

mode while a start condition is detected

[Clearing condition]

• When 0 is written to this bit after reading AL = 1

(When the CPU is used to clear this flag by writing

0 while the corresponding interrupt is enabled, be

sure to read the flag after writing 0 to it.)

AAS

R/W

Slave Address Recognition Flag

In slave receive mode, this flag is set to 1 when the first

frame following a start condition matches bits SVA6 to

SVA0 in SAR.

[Setting conditions]

• When the slave address is detected in slave

receive mode

• When the general call address is detected in slave

receive mode

[Clearing condition]

• When 0 is written to this bit after reading AAS = 1

(When the CPU is used to clear this flag by writing

0 while the corresponding interrupt is enabled, be

sure to read the flag after writing 0 to it.)

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