Datasheet

Section 21 I
2
C Bus Interface 2 (IIC2)
Page 744 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
• AL_OVE bit (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.
• AAS bit (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.
21.2.7 Slave Address Register (SAR)
Address:
Bit:
Value after reset:
b7
0
b6
0
b5
0
b4
0
b3
0
b2
0
b1
0
b0
FS
0
H'FF05CD
SVA[6:0]
Bit Symbol Bit Name Description R/W
7 to 1 SVA[6:0] Slave address
6 to 0
These bits set a unique address in bits SVA[6:0],
differing form the addresses of other slave devices
connected to the I
2
C bus.
R/W
0 FS Format select 0: I
2
C bus format is selected.
1: Clock synchronous serial format is selected.
R/W
SAR selects the format and sets the slave address. When SAR is in slave mode with the I
2
C bus
format, if the upper 7 bits of SAR match the upper 7 bits of the first frame received after a start
condition, SAR operates as the slave device.