Datasheet

Section 17 I
2
C Bus Interface 2 (IIC2)
Page 1034 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
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]
• When a stop condition is detected after frame
transfer.
[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 SDA pin outputs high in master mode
while a start condition is detected.
[Clearing condition]
• When 0 is written in AL after reading AL =1.