Datasheet

Section 15 I
2
C Bus Interface 2 (IIC2)
Rev. 3.00 Sep. 14, 2006 Page 251 of 408
REJ09B0105-0300
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 conditions]
• 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/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