p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 426

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 I
Note:
Rev. 1.00 Sep. 21, 2006 Page 388 of 658
REJ09B0310-0100
Bit
0
Bit Name
ACKB
*
Only 0 can be written to clear the flag.
2
C Bus Interface (IIC)
Initial
Value
0
R/W
R/W
Description
Acknowledge Bit
Stores acknowledge data.
Transmit mode:
[Setting condition]
When 1 is received as the acknowledge bit when ACKE = 1
in transmit mode
[Clearing conditions]
•
•
Receive mode:
0: Returns 0 as acknowledge data after data reception
1: Returns 1 as acknowledge data after data reception
When this bit is read, the value loaded from the bus line
(returned by the receiving device) is read in transmission
(when TRS = 1). In reception (when TRS = 0), the value set
by internal software is read.
When this bit is written, acknowledge data that is returned
after receiving is rewritten regardless of the TRS value. If the
ICSR register bit is written using bit-manipulation
instructions, the acknowledge data should be re-set since
the acknowledge data setting is rewritten by the ACKB bit
reading value.
Write the ACKE bit to 0 to clear the ACKB flag to 0, before
transmission is ended and a stop condition is issued in
master mode, or before transmission is ended and SDA is
released to issue a stop condition by a master device.
When 0 is received as the acknowledge bit when ACKE
= 1 in transmit mode
When 0 is written to the ACKE bit