Datasheet

Section 15 I
2
C Bus Interface 2 (IIC2)
Rev.5.00 Nov. 02, 2005 Page 243 of 418
REJ09B0028-0500
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
0 ADZ 0 R/W General Call Address Recognition Flag
This bit is valid in I
2
C bus format slave receive mode.
[Setting condition]
• When the general call address is detected in slave
receive mode
[Clearing condition]
• When 0 is written in ADZ after reading ADZ = 1