Section 17 I2C Bus Interface 2 (IIC2)
Initial
Bit
Bit Name Value
R/W
Description
2
ACKE
0
R/W
Acknowledge Bit Judgment Select
0: The value of the receive acknowledge bit is ignored,
and continuous transfer is performed.
1: If the receive acknowledge bit is 1, continuous transfer
is halted.
1
0
ACKBR
0
R
Receive Acknowledge
In transmit mode, this bit stores the acknowledge data
that are returned by the receive device. This bit cannot be
modified.
0: Receive acknowledge = 0
1: Receive acknowledge = 1
Transmit Acknowledge
ACKBT
0
R/W
In receive mode, this bit specifies the bit to be sent at the
acknowledge timing.
0: 0 is sent at the acknowledge timing.
1: 1 is sent at the acknowledge timing.
17.3.5
I2C Bus Status Register (ICSR)
ICSR performs confirmation of interrupt request flags and status.
Initial
Bit
Bit Name Value
R/W
Description
7
TDRE
0
R/W
Transmit Data Register Empty
[Setting conditions]
•
When data is transferred from ICDRT to ICDRS and
ICDRT becomes empty
•
•
When TRS is set
When a start condition (including re-transfer) has
been issued
•
When transmit mode is entered from receive mode in
slave mode
[Clearing conditions]
•
•
When 0 is written in TDRE after reading TDRE = 1
When data is written to ICDRT with an instruction
Rev. 3.00 Sep. 10, 2007 Page 340 of 528
REJ09B0216-0300
RENESAS [ RENESAS TECHNOLOGY CORP ]
