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    10 <!DOCTYPE concept

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

    12 <concept id="GUID-A25FFD79-0797-43EC-8975-8C23E7E539C4" xml:lang="en"><title>Register Access Technology Guide</title><shortdesc>Provides information about the Register Access technology.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    13 <p>The Register Access platform service is implemented in the ASSP

    14 layer. The Register Access functionality is provided to the clients

    15 by implementing the <xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita"><apiname>AsspRegister</apiname></xref> class.</p>

    16 <section id="GUID-F80CF14A-3CB2-41B1-A3BD-DBD116FDBA8C-GENID-1-2-1-10-1-5-1-8-1-1-7-1-3-2">         

    17    <title>Purpose</title>             <p>The Register Access platform

    18 service provides an interface to the kernel and device drivers to

    19 read, write or modify the contents of only the ASSP registers.</p>  </section>

    20 <section id="GUID-59E2379C-CD1F-4ABD-A380-2195651D1443"><title>Key

    21 concepts</title><dl>

    22 <dlentry>

    23 <dt>Register</dt>

    24 <dd><p>A register is a memory location on the ASSP hardware to store

    25 data that relates to the operation of that hardware. The Symbian platform

    26 support registers that can store 8, 16, 32 and 64–bit data.</p></dd>

    27 </dlentry>

    28 <dlentry>

    29 <dt>Bitmask</dt>

    30 <dd><p>The <codeph>Modify</codeph> function of the AsspRegister class

    31 allows the clients to set or clear certain bits stored in the register.</p></dd>

    32 </dlentry>

    33 <dlentry>

    34 <dt>Application-Specific Standard Product (ASSP)</dt>

    35 <dd><p>ASSP is an integrated circuit consisting of CPU, Memory Management

    36 Unit (MMU), cache and a number of on-chip peripherals, which is intended

    37 to be used in a class of devices. Typical examples include UARTs,

    38 timers, LCD controller that are designed and marketed by a silicon

    39 vendor.</p></dd>

    40 </dlentry>

    41 </dl></section>

    42 <section id="GUID-44AD8B68-B9AF-472A-A4E5-6102B3767E97"><title>Typical

    43 uses</title><p>The Register Access platform service allows the clients

    44 to:</p><ul>

    45 <li><p>read data stored in 8, 16, 32 and 64–bit registers</p></li>

    46 <li><p>store data in 8. 16, 32 and 64–bit registers</p></li>

    47 <li><p>change certain bits of the data in 8, 16, 32 and 64–bit registers.</p></li>

    48 </ul></section>

    49 </conbody></concept>