Datasheet

Section 16 I
2
C Bus Interface 2 (IIC2) (Option)
Rev.7.00 Mar. 18, 2009 page 783 of 1136
REJ09B0109-0700
Bit Bit Name Initial Value R/W Description
4 NACKF 0 R/W No acknowledge detection flag
[Setting condition]
• When no acknowledge is detected from the
receive device in transmission while the ACKE bit
in ICIER is 1
[Clearing condition]
• When 0 is written in NACKF after reading NACKF
= 1
3 STOP 0 R/W Stop condition detection flag
[Setting condition]
• In master mode, when a stop condition is detected
after frame transfer
• In slave mode, when a stop condition is detected
after the general call address or the first byte
slave address, next to detection of start condition,
accords with the address set in SAR
[Clearing condition]
• When 0 is written in STOP after reading STOP = 1
2 AL 0 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, 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 internal SDA high in master mode while
a start condition is detected
[Clearing condition]
• When 0 is written in AL/OVE after reading
AL/OVE=1