LM3S1162 Luminary Micro, Inc, LM3S1162 Datasheet - Page 380
LM3S1162
Manufacturer Part Number
LM3S1162
Description
Lm3s1162 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1162.pdf
(533 pages)
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Inter-Integrated Circuit (I
15.2.1
15.2.1.1 START and STOP Conditions
15.2.1.2 Data Format with 7-Bit Address
380
Figure 15-2. I
SDA
I
The I
microcontrollers. SDA is the bi-directional serial data line and SCL is the bi-directional serial clock
line. The bus is considered idle when both lines are high.
Every transaction on the I
acknowledge bit. The number of bytes per transfer (defined as the time between a valid START
and STOP condition, described in “START and STOP Conditions” on page 380) is unrestricted, but
each byte has to be followed by an acknowledge bit, and data must be transferred MSB first. When
a receiver cannot receive another complete byte, it can hold the clock line SCL Low and force the
transmitter into a wait state. The data transfer continues when the receiver releases the clock SCL.
The protocol of the I
A high-to-low transition on the SDA line while the SCL is high is defined as a START condition, and
a low-to-high transition on the SDA line while SCL is high is defined as a STOP condition. The bus
is considered busy after a START condition and free after a STOP condition. See Figure
15-3 on page 380.
Figure 15-3. START and STOP Conditions
SDA
Data transfers follow the format shown in Figure 15-4 on page 381. After the START condition, a
slave address is sent. This address is 7-bits long followed by an eighth bit, which is a data direction
bit (R/S bit in the I2CMSA register). A zero indicates a transmit operation (send), and a one indicates
a request for data (receive). A data transfer is always terminated by a STOP condition generated
by the master, however, a master can initiate communications with another device on the bus by
generating a repeated START condition and addressing another slave without first generating a
STOP condition. Various combinations of receive/send formats are then possible within a single
transfer.
SCL
SCL
2
C Bus Functional Overview
2
C bus uses only two signals: SDA and SCL, named I2CSDA and I2CSCL on Stellaris
I2CSCL
Stellaris TM
condition
START
2
C) Interface
2
I2CSDA
C Bus Configuration
2
R PUP
C bus defines two states to begin and end a transaction: START and STOP.
2
with I 2 C Interface
3rd Party Device
C bus is nine bits long, consisting of eight data bits and a single
SCL
R PUP
SDA
Preliminary
with I 2 C Interface
3rd Party Device
SCL
condition
STOP
SDA
I 2 C Bus
SDA
SCL
July 26, 2008
®
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