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1、程序目的：介绍AT91SAM7S256-EK TWI的基本用法： 2、 功能说明:通过TWI实现I2C

<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x414</b></font></td><td><font size="-1">PIOA_ODR (<a href="#PIO_ODR">PIO_ODR</a>)</font></td><td><font size="-1">Output Disable Registerr</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x418</b></font></td><td><font size="-1">PIOA_OSR (<a href="#PIO_OSR">PIO_OSR</a>)</font></td><td><font size="-1">Output Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x420</b></font></td><td><font size="-1">PIOA_IFER (<a href="#PIO_IFER">PIO_IFER</a>)</font></td><td><font size="-1">Input Filter Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x424</b></font></td><td><font size="-1">PIOA_IFDR (<a href="#PIO_IFDR">PIO_IFDR</a>)</font></td><td><font size="-1">Input Filter Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x428</b></font></td><td><font size="-1">PIOA_IFSR (<a href="#PIO_IFSR">PIO_IFSR</a>)</font></td><td><font size="-1">Input Filter Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x430</b></font></td><td><font size="-1">PIOA_SODR (<a href="#PIO_SODR">PIO_SODR</a>)</font></td><td><font size="-1">Set Output Data Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x434</b></font></td><td><font size="-1">PIOA_CODR (<a href="#PIO_CODR">PIO_CODR</a>)</font></td><td><font size="-1">Clear Output Data Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x438</b></font></td><td><font size="-1">PIOA_ODSR (<a href="#PIO_ODSR">PIO_ODSR</a>)</font></td><td><font size="-1">Output Data Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x43C</b></font></td><td><font size="-1">PIOA_PDSR (<a href="#PIO_PDSR">PIO_PDSR</a>)</font></td><td><font size="-1">Pin Data Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x440</b></font></td><td><font size="-1">PIOA_IER (<a href="#PIO_IER">PIO_IER</a>)</font></td><td><font size="-1">Interrupt Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x444</b></font></td><td><font size="-1">PIOA_IDR (<a href="#PIO_IDR">PIO_IDR</a>)</font></td><td><font size="-1">Interrupt Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x448</b></font></td><td><font size="-1">PIOA_IMR (<a href="#PIO_IMR">PIO_IMR</a>)</font></td><td><font size="-1">Interrupt Mask Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x44C</b></font></td><td><font size="-1">PIOA_ISR (<a href="#PIO_ISR">PIO_ISR</a>)</font></td><td><font size="-1">Interrupt Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x450</b></font></td><td><font size="-1">PIOA_MDER (<a href="#PIO_MDER">PIO_MDER</a>)</font></td><td><font size="-1">Multi-driver Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x454</b></font></td><td><font size="-1">PIOA_MDDR (<a href="#PIO_MDDR">PIO_MDDR</a>)</font></td><td><font size="-1">Multi-driver Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x458</b></font></td><td><font size="-1">PIOA_MDSR (<a href="#PIO_MDSR">PIO_MDSR</a>)</font></td><td><font size="-1">Multi-driver Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x460</b></font></td><td><font size="-1">PIOA_PPUDR (<a href="#PIO_PPUDR">PIO_PPUDR</a>)</font></td><td><font size="-1">Pull-up Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x464</b></font></td><td><font size="-1">PIOA_PPUER (<a href="#PIO_PPUER">PIO_PPUER</a>)</font></td><td><font size="-1">Pull-up Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x468</b></font></td><td><font size="-1">PIOA_PPUSR (<a href="#PIO_PPUSR">PIO_PPUSR</a>)</font></td><td><font size="-1">Pull-up Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x470</b></font></td><td><font size="-1">PIOA_ASR (<a href="#PIO_ASR">PIO_ASR</a>)</font></td><td><font size="-1">Select A Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x474</b></font></td><td><font size="-1">PIOA_BSR (<a href="#PIO_BSR">PIO_BSR</a>)</font></td><td><font size="-1">Select B Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x478</b></font></td><td><font size="-1">PIOA_ABSR (<a href="#PIO_ABSR">PIO_ABSR</a>)</font></td><td><font size="-1">AB Select Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x4A0</b></font></td><td><font size="-1">PIOA_OWER (<a href="#PIO_OWER">PIO_OWER</a>)</font></td><td><font size="-1">Output Write Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x4A4</b></font></td><td><font size="-1">PIOA_OWDR (<a href="#PIO_OWDR">PIO_OWDR</a>)</font></td><td><font size="-1">Output Write Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x4A8</b></font></td><td><font size="-1">PIOA_OWSR (<a href="#PIO_OWSR">PIO_OWSR</a>)</font></td><td><font size="-1">Output Write Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x600</b></font></td><td><font size="-1">PIOB_PER (<a href="#PIO_PER">PIO_PER</a>)</font></td><td><font size="-1">PIO Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x604</b></font></td><td><font size="-1">PIOB_PDR (<a href="#PIO_PDR">PIO_PDR</a>)</font></td><td><font size="-1">PIO Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x608</b></font></td><td><font size="-1">PIOB_PSR (<a href="#PIO_PSR">PIO_PSR</a>)</font></td><td><font size="-1">PIO Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x610</b></font></td><td><font size="-1">PIOB_OER (<a href="#PIO_OER">PIO_OER</a>)</font></td><td><font size="-1">Output Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x614</b></font></td><td><font size="-1">PIOB_ODR (<a href="#PIO_ODR">PIO_ODR</a>)</font></td><td><font size="-1">Output Disable Registerr</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x618</b></font></td><td><font size="-1">PIOB_OSR (<a href="#PIO_OSR">PIO_OSR</a>)</font></td><td><font size="-1">Output Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x620</b></font></td><td><font size="-1">PIOB_IFER (<a href="#PIO_IFER">PIO_IFER</a>)</font></td><td><font size="-1">Input Filter Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x624</b></font></td><td><font size="-1">PIOB_IFDR (<a href="#PIO_IFDR">PIO_IFDR</a>)</font></td><td><font size="-1">Input Filter Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x628</b></font></td><td><font size="-1">PIOB_IFSR (<a href="#PIO_IFSR">PIO_IFSR</a>)</font></td><td><font size="-1">Input Filter Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x630</b></font></td><td><font size="-1">PIOB_SODR (<a href="#PIO_SODR">PIO_SODR</a>)</font></td><td><font size="-1">Set Output Data Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x634</b></font></td><td><font size="-1">PIOB_CODR (<a href="#PIO_CODR">PIO_CODR</a>)</font></td><td><font size="-1">Clear Output Data Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x638</b></font></td><td><font size="-1">PIOB_ODSR (<a href="#PIO_ODSR">PIO_ODSR</a>)</font></td><td><font size="-1">Output Data Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x63C</b></font></td><td><font size="-1">PIOB_PDSR (<a href="#PIO_PDSR">PIO_PDSR</a>)</font></td><td><font size="-1">Pin Data Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x640</b></font></td><td><font size="-1">PIOB_IER (<a href="#PIO_IER">PIO_IER</a>)</font></td><td><font size="-1">Interrupt Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x644</b></font></td><td><font size="-1">PIOB_IDR (<a href="#PIO_IDR">PIO_IDR</a>)</font></td><td><font size="-1">Interrupt Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x648</b></font></td><td><font size="-1">PIOB_IMR (<a href="#PIO_IMR">PIO_IMR</a>)</font></td><td><font size="-1">Interrupt Mask Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x64C</b></font></td><td><font size="-1">PIOB_ISR (<a href="#PIO_ISR">PIO_ISR</a>)</font></td><td><font size="-1">Interrupt Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x650</b></font></td><td><font size="-1">PIOB_MDER (<a href="#PIO_MDER">PIO_MDER</a>)</font></td><td><font size="-1">Multi-driver Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x654</b></font></td><td><font size="-1">PIOB_MDDR (<a href="#PIO_MDDR">PIO_MDDR</a>)</font></td><td><font size="-1">Multi-driver Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x658</b></font></td><td><font size="-1">PIOB_MDSR (<a href="#PIO_MDSR">PIO_MDSR</a>)</font></td><td><font size="-1">Multi-driver Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x660</b></font></td><td><font size="-1">PIOB_PPUDR (<a href="#PIO_PPUDR">PIO_PPUDR</a>)</font></td><td><font size="-1">Pull-up Disable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x664</b></font></td><td><font size="-1">PIOB_PPUER (<a href="#PIO_PPUER">PIO_PPUER</a>)</font></td><td><font size="-1">Pull-up Enable Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x668</b></font></td><td><font size="-1">PIOB_PPUSR (<a href="#PIO_PPUSR">PIO_PPUSR</a>)</font></td><td><font size="-1">Pull-up Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x670</b></font></td><td><font size="-1">PIOB_ASR (<a href="#PIO_ASR">PIO_ASR</a>)</font></td><td><font size="-1">Select A Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x674</b></font></td><td><font size="-1">PIOB_BSR (<a href="#PIO_BSR">PIO_BSR</a>)</font></td><td><font size="-1">Select B Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x678</b></font></td><td><font size="-1">PIOB_ABSR (<a href="#PIO_ABSR">PIO_ABSR</a>)</font></td><td><font size="-1">AB Select Status Register</font></td></tr>
<tr><td align="CENTER" bgcolor="#FFFFCC"><font size="-1"><b>0x6A0</b></font></td><td><font size="-1">PIOB_OWER (<a href="#PIO_OWER">PIO_OWER</a>)</font></td><td><font size="-1">Output Write Enable Register</font></td></tr>