Datasheet

Section 18 I
2
C Bus Interface 2 (IIC2)
Rev. 3.00 Mar. 15, 2006 Page 354 of 526
REJ09B0060-0300
Bit Bit Name
Initial
Value R/W Description
2 AL/OVE 0 R/W Arbitration Lost Flag/Overrun Error Flag
This flag indicates that arbitration was lost in master
mode with the I
2
C bus format and that the final bit has
been received while RDRF = 1 with the clocked
synchronous format.
When two or more master devices attempt to seize the
bus at nearly the same time, if the I
2
C 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]
• If the internal SDA and SDA pin disagree at the rise
of SCL in master transmit mode
• When the SDA pin outputs high in master mode
while a start condition is detected
• When the final bit is received with the clocked
synchronous format while RDRF = 1
[Clearing condition]
• When 0 is written in AL/OVE after reading
AL/OVE=1
1 AAS 0 R/W Slave Address Recognition Flag
In slave receive mode, this flag is set to 1 if 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 in AAS after reading AAS=1