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<title>Hardware API Selector: AT91SAM7SE512 Definitions</title>
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<h1>Two-wire Interface Peripheral</h1>
<null><a name="TWI"></a><b>TWI</b> <i><font size="-1">(<a href="AT91SAM7SE512_h.html#AT91S_TWI">AT91S_TWI</a>)</font></i><b> 0xFFFB8000 </b><i><font size="-1">(<a href="AT91SAM7SE512_h.html#AT91C_BASE_TWI">AT91C_BASE_TWI</a>)</font></i>
<table border=1 cellpadding=3 cellspacing=0><null><th bgcolor="#FFFFCC"><font size="-1">Periph ID <a href="#AIC">AIC</a></font></th><th bgcolor="#FFFFCC"><font size="-1">Symbol</font></th><th bgcolor="#FFFFCC"><font size="-1">Description</font></th><tr><td bgcolor="#FFFFCC"><font size="-1"><b>9</b> </font></td><td><font size="-1"><i><font size="-1">(<a href="AT91SAM7SE512_h.html#AT91C_ID_TWI">AT91C_ID_TWI</a>)</font></i></font></td><td><font size="-1">Two-Wire Interface</font></td></tr>
</null></table><br><table border=1 cellpadding=3 cellspacing=0><null><th bgcolor="#FFFFCC"><font size="-1"><b>Signal</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Symbol</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>PIO controller</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Description</b>
</font></th><tr><td bgcolor="#FFFFCC"><font size="-1"><b>TWD</b></font></td><td><font size="-1"><i><font size="-1">(<a href="#AT91C_PA3_TWD ">AT91C_PA3_TWD </a>)</font></i></font></td><td><font size="-1"><a href="AT91SAM7SE512_PIO.html#PIOA">PIOA</a> Periph: A Bit: 3</font></td><td><font size="-1"></font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b>TWCK</b></font></td><td><font size="-1"><i><font size="-1">(<a href="#AT91C_PA4_TWCK ">AT91C_PA4_TWCK </a>)</font></i></font></td><td><font size="-1"><a href="AT91SAM7SE512_PIO.html#PIOA">PIOA</a> Periph: A Bit: 4</font></td><td><font size="-1"></font></td></tr>
</null></table><br><table border=1 cellpadding=0 cellspacing=0 width="100%"><null><th bgcolor="#FFFFCC"><font size="-1"><b>Function</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Description</b></font></th><tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM7SE512_h.html#AT91F_TWI_CfgPIO">AT91F_TWI_CfgPIO</a></b></font></td><td><font size="-1">Configure PIO controllers to drive TWI signals</font></td></tr>
<tr><td bgcolor="#FFFFCC"><font size="-1"><b><a href="lib_AT91SAM7SE512_h.html#AT91F_TWI_CfgPMC">AT91F_TWI_CfgPMC</a></b></font></td><td><font size="-1">Enable Peripheral clock in PMC for TWI</font></td></tr>
</null></table><br><br></null><a name="TWI"></a><h2>TWI Software API <i><font size="-1">(<a href="AT91SAM7SE512_h.html#AT91S_TWI">AT91S_TWI</a>)</font></i></h2>
<a name="TWI"></a><null><table border=1 cellpadding=0 cellspacing=0 width="100%"><null><th bgcolor="#FFFFCC"><font size="-1"><b>Offset</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Field</b></font></th><th bgcolor="#FFFFCC"><font size="-1"><b>Description</b></font></th>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x0</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_CR">TWI_CR</a></font></td><td><font size="-1">Control Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x4</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_MMR">TWI_MMR</a></font></td><td><font size="-1">Master Mode Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x8</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_SMR">TWI_SMR</a></font></td><td><font size="-1">Slave Mode Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0xC</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_IADR">TWI_IADR</a></font></td><td><font size="-1">Internal Address Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x10</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_CWGR">TWI_CWGR</a></font></td><td><font size="-1">Clock Waveform Generator Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x20</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_SR">TWI_SR</a></font></td><td><font size="-1">Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x24</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_IER">TWI_IER</a></font></td><td><font size="-1">Interrupt Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x28</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_IDR">TWI_IDR</a></font></td><td><font size="-1">Interrupt Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x2C</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_IMR">TWI_IMR</a></font></td><td><font size="-1">Interrupt Mask Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x30</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_RHR">TWI_RHR</a></font></td><td><font size="-1">Receive Holding Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x34</b></font></td><td><font size="-1"><a href="AT91SAM7SE512_TWI.html#TWI_THR">TWI_THR</a></font></td><td><font size="-1">Transmit Holding Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x100</b></font></td><td><font size="-1">TWI_RPR (<a href="AT91SAM7SE512_PDC.html#PDC_RPR">PDC_RPR</a>)</font></td><td><font size="-1">Receive Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x104</b></font></td><td><font size="-1">TWI_RCR (<a href="AT91SAM7SE512_PDC.html#PDC_RCR">PDC_RCR</a>)</font></td><td><font size="-1">Receive Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x108</b></font></td><td><font size="-1">TWI_TPR (<a href="AT91SAM7SE512_PDC.html#PDC_TPR">PDC_TPR</a>)</font></td><td><font size="-1">Transmit Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x10C</b></font></td><td><font size="-1">TWI_TCR (<a href="AT91SAM7SE512_PDC.html#PDC_TCR">PDC_TCR</a>)</font></td><td><font size="-1">Transmit Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x110</b></font></td><td><font size="-1">TWI_RNPR (<a href="AT91SAM7SE512_PDC.html#PDC_RNPR">PDC_RNPR</a>)</font></td><td><font size="-1">Receive Next Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x114</b></font></td><td><font size="-1">TWI_RNCR (<a href="AT91SAM7SE512_PDC.html#PDC_RNCR">PDC_RNCR</a>)</font></td><td><font size="-1">Receive Next Counter Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x118</b></font></td><td><font size="-1">TWI_TNPR (<a href="AT91SAM7SE512_PDC.html#PDC_TNPR">PDC_TNPR</a>)</font></td><td><font size="-1">Transmit Next Pointer Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x11C</b></font></td><td><font size="-1">TWI_TNCR (<a href="AT91SAM7SE512_PDC.html#PDC_TNCR">PDC_TNCR</a>)</font></td><td><font size="-1">Transmit Next Counter Register</font></td></tr>
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