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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-C661BFA4-6C39-476A-8DE0-08E18AA0F548" xml:lang="en"><title>IIC Overview</title><shortdesc>Provides a basic summary of the Inter-Integrated Circuit

    13 (IIC) platform service. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>The IIC is a technology-independent interface for serial bus technologies.

    15 The IIC supports multi-master and multi-slave serial interfaces, used

    16 by the low power peripherals to exchange control information between

    17 devices attached to the bus. The IIC supports different modes of data

    18 transfer.</p>

    19 <section id="GUID-E67D9AC2-DD3D-48FD-9E48-B79BC73FFE6A-GENID-1-2-1-10-1-5-1-6-1-1-3-1-3-2"><title>What

    20 is the IIC platform service</title>             <p>The IIC platform

    21 service provides a set of functions for device drivers to be able

    22 to use serial interfaces without needing to know the details of the

    23 actual chipset implementing the particular serial interface technology,

    24 for example I2C or SPI. The client will however need to understand

    25 how to configure headers for the particular interface technology.</p><p>For the technical details about IIC, see the <xref href="GUID-DCDD68C7-8EBE-4E91-A983-076460B2C2F3.dita">IIC Quick Start</xref>.</p>         </section>

    26 <section id="GUID-C0FC9485-8B8C-4F4B-99C0-DAA48FB5E85D"><title>Need

    27 for the IIC platform service</title><p>IIC is used in a number of

    28 different areas in the OS. These may include:</p><ul>

    29 <li><p>controlling flash memory devices</p></li>

    30 <li><p>controlling the LCD</p></li>

    31 <li><p>reading data from the Real Time Clock.</p></li>

    32 </ul><p>The IIC platform service gives a common set of functions to

    33 initiate a connection and to transfer the data.</p></section>

    34 <section id="GUID-CEAC0FBB-77F6-48FF-AB70-0E2AB78CA972"><title>IIC

    35 users</title><p>The IIC documentation covers two types of user: </p><p><ul>

    36 <li><p>those that want to write device drivers </p></li>

    37 <li><p>those that need to write SHAI implementation code to interface

    38 to their particular IIC chipset.</p></li>

    39 </ul></p></section>

    40 <section id="GUID-0D17421E-77CC-47CC-A50A-DE9F8E7020BF"><title>Limitations</title><p>IIC is an abstraction interface for several different serial bus

    41 communication technologies. There may be features of a particular

    42 technology that are not available through IIC. IIC imposes no throughput

    43 limitations. </p></section>

    44 </conbody></concept>