Datasheet

Section 22 I
2
C Bus Interface 2 (IIC2)
Rev. 2.00 Jul. 04, 2007 Page 492 of 692
REJ09B0309-0200
Bit Bit Name
Initial
Value
R/W Description
4 NACKF 0 R/(W)* No Acknowledge Detection Flag
[Setting condition]
• No acknowledge is detected from the receive device
in transmission while the ACKE bit in ICIER is 1
[Clearing condition]
• Writing of 0 to bit NACKF after reading NACKF = 1
3 STOP 0 R/(W)* Stop Condition Detection Flag
[Setting conditions]
• In master mode, a stop condition is detected after
frame transferred
• In slave mode, the slave address in the first byte
after the general call and detecting start condition
matches the address set in SAR, and then the stop
condition is detected
[Clearing condition]
• Writing of 0 to bit STOP after reading STOP = 1
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 clock
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]
• The internal SDA and SDA pin disagree at the rise
of SCL in master transmit mode
• The SDA pin outputs high in master mode while a
start condition is detected
• The final bit is received with the clock synchronous
format while RDRF = 1
[Clearing condition]
• Writing of 0 to bit AL/OVE after reading AL/OVE=1