p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 415

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

Bit
2
0
Bit Name
BBSY
SCP
Initial
Value
0
1
R/W
R/W
W
Description
Bus Busy
Start Condition/Stop Condition Prohibit
In master mode:
•
•
In slave mode:
•
[BBSY setting condition]
When the SDA level changes from high to low under the
condition of SCL = high, assuming that the start condition
has been issued.
[BBSY clearing condition]
When the SDA level changes from low to high under the
condition of SCL = high, assuming that the stop condition
has been issued.
To issue a start/stop condition, use the MOV instruction.
The I
before the issue of a start condition. Set MST to 1 and TRS
to 1 before writing 1 in BBSY and 0 in SCP.
The BBSY flag can be read to check whether the I
(SCL, SDA) is busy or free.
The SCP bit is always read as 1. If 0 is written, the data is
not stored.
Writing 0 in BBSY and 0 in SCP: A stop condition is
issued
Writing 1 in BBSY and 0 in SCP: A start condition and a
restart condition are issued
Writing to the BBSY flag is disabled.
2
C bus interface must be set in master transmit mode
Rev. 1.00 Sep. 21, 2006 Page 377 of 658
Section 16 I
2
C Bus Interface (IIC)
REJ09B0310-0100
2
C bus