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<title>AVRDUDE: E.3 Modern AVR Parts</title>
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<a name="Modern-AVR-Parts"></a>
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<a name="Modern-AVR-Parts-1"></a>
<h2 class="section">E.3 Modern AVR Parts</h2>
<a name="index-Memories-of-modern-AVR-parts"></a>
<a name="index-signature-7"></a>
<a name="index-flash-48"></a>
<a name="index-eeprom-18"></a>
<p>Modern 8-bit AVR devices have the following memories in addition to
<code>eeprom</code>, <code>flash</code>, <code>signature</code> and <code>lock</code>:
</p><dl compact="compact">
<dd><a name="index-wdtcfg"></a>
</dd>
<dt> <code>fuse0</code></dt>
<dd><p>A.k.a. <code>wdtcfg</code>: watchdog configuration
<a name="index-bodcfg"></a>
</p></dd>
<dt> <code>fuse1</code></dt>
<dd><p>A.k.a. <code>bodcfg</code>: brownout detection configuration
<a name="index-osccfg"></a>
</p></dd>
<dt> <code>fuse2</code></dt>
<dd><p>A.k.a. <code>osccfg</code>: oscillator configuration
<a name="index-tcd0cfg"></a>
</p></dd>
<dt> <code>fuse4</code></dt>
<dd><p>A.k.a. <code>tcd0cfg</code> (not all devices): timer counter type D configuration
<a name="index-syscfg0"></a>
</p></dd>
<dt> <code>fuse5</code></dt>
<dd><p>A.k.a. <code>syscfg0</code>: system configuration 0
<a name="index-syscfg1"></a>
</p></dd>
<dt> <code>fuse6</code></dt>
<dd><p>A.k.a. <code>syscfg1</code>: system configuration 1
<a name="index-append"></a>
<a name="index-codesize"></a>
</p></dd>
<dt> <code>fuse7</code></dt>
<dd><p>A.k.a. <code>append</code> or <code>codesize</code>: either the end of the application code section or the code size in blocks of 256/512 bytes
<a name="index-bootend"></a>
<a name="index-bootsize"></a>
</p></dd>
<dt> <code>fuse8</code></dt>
<dd><p>A.k.a. <code>bootend</code> or <code>bootsize</code>: end of the boot section or the boot size in blocks of 256/512 bytes
<a name="index-pdicfg"></a>
</p></dd>
<dt> <code>fusea</code></dt>
<dd><p>A.k.a. <code>pdicfg</code>: configures/locks updi access; it is the only fuse that consists of two bytes
<a name="index-fuses-1"></a>
</p></dd>
<dt> <code>fuses</code></dt>
<dd><p>A logical memory of up to 16 bytes containing all fuseX of a part, which can be used to program all fuses at the same time
<a name="index-osc16err"></a>
</p></dd>
<dt> <code>osc16err</code></dt>
<dd><p>Two bytes typically describing the 16 MHz oscillator frequency error at 3 V and 5 V, respectively
<a name="index-osc20err"></a>
</p></dd>
<dt> <code>osc20err</code></dt>
<dd><p>Two bytes typically describing the 20 MHz oscillator frequency error at 3 V and 5 V, respectively
<a name="index-osccal16"></a>
</p></dd>
<dt> <code>osccal16</code></dt>
<dd><a name="index-calibration-6"></a>
<p>Two oscillator calibration bytes for 16 MHz
<a name="index-osccal20"></a>
</p></dd>
<dt> <code>osccal20</code></dt>
<dd><a name="index-calibration-7"></a>
<p>Two oscillator calibration bytes for 20 MHz
<a name="index-prodsig-1"></a>
</p></dd>
<dt> <code>prodsig</code></dt>
<dd><a name="index-signature-8"></a>
<p>Read-only memory section for factory programmed data such as the
signature, calibration values and serial number
<a name="index-sigrow-1"></a>
</p></dd>
<dt> <code>sigrow</code></dt>
<dd><p>Memory alias for prodsig
<a name="index-sernum-1"></a>
</p></dd>
<dt> <code>sernum</code></dt>
<dd><p>Serial number with a unique ID for the part (10 or 16 bytes)
<a name="index-tempsense-1"></a>
</p></dd>
<dt> <code>tempsense</code></dt>
<dd><a name="index-calibration-8"></a>
<p>Temperature sensor calibration values
<a name="index-bootrow-3"></a>
</p></dd>
<dt> <code>bootrow</code></dt>
<dd><p>Extra page of memory that is only accessible by the MCU in bootloader
code; UDPI can read and write this memory only when the device is
unlocked
<a name="index-eeprom-19"></a>
<a name="index-userrow"></a>
</p></dd>
<dt> <code>userrow</code></dt>
<dd><p>Extra page of EEPROM memory that can be used for firmware settings; this
memory is not erased during a chip erase
<a name="index-sib"></a>
</p></dd>
<dt> <code>sib</code></dt>
<dd><p>Special system information block memory with information about AVR family, chip revision etc.
<a name="index-io-1"></a>
</p></dd>
<dt> <code>io</code></dt>
<dd><p>Volatile register memory; AVRDUDE can program this memory but this is of
limited utility because anything written to the io memory will be undefined or
lost after reset; writing to individual registers in the terminal can
still be used, e.g., to test I/O ports
<a name="index-sram-1"></a>
</p></dd>
<dt> <code>sram</code></dt>
<dd><p>Volatile RAM memory; can be read and written but contents will be lost after reset
</p></dd>
</dl>
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