at keyboard interfacing.htm

关于PS/2和USB键盘、鼠标的各种扫描码的资料。

            <TABLE border=1 cellPadding=2 cellSpacing=0>
              <TBODY>
              <TR>
                <TD>Pin</TD>
                <TD>Name</TD>
                <TD>Function</TD></TR>
              <TR>
                <TD>0</TD>
                <TD>T0</TD>
                <TD>Keyboard Clock&nbsp; <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>1</TD>
                <TD>T1</TD>
                <TD>Keyboard Data <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>2</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>3</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>4</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>5</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>6</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>7</TD>
                <TD>--</TD>
                <TD><BR>Undefined 
        <BR>.</TD></TR></TBODY></TABLE></CENTER></TD></TR></TBODY></TABLE></CENTER>
      <P><U>PS/2-compatible mode</U> </P>
      <CENTER>
      <TABLE border=0 cellPadding=5 cellSpacing=0>
        <TBODY>
        <TR>
          <TD>Port 1 (Input Port): 
            <CENTER>
            <TABLE border=1 cellPadding=2 cellSpacing=0>
              <TBODY>
              <TR>
                <TD>Pin</TD>
                <TD>Name</TD>
                <TD>Function</TD></TR>
              <TR>
                <TD>0</TD>
                <TD>P10</TD>
                <TD>Keyboard Data <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>1</TD>
                <TD>P11</TD>
                <TD>Mouse Data <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>2</TD>
                <TD>P12</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>3</TD>
                <TD>P13</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>4</TD>
                <TD>P14</TD>
                <TD>External RAM <BR>1: Enable external RAM <BR>0: Disable 
                  external RAM</TD></TR>
              <TR>
                <TD>5</TD>
                <TD>P15</TD>
                <TD>Manufacturing Setting <BR>1: Setting enabled <BR>0: 
                  Setting disabled</TD></TR>
              <TR>
                <TD>6</TD>
                <TD>P16</TD>
                <TD>Display Type Switch <BR>1: Color display <BR>0: 
                Monochrome</TD></TR>
              <TR>
                <TD>7</TD>
                <TD>P17</TD>
                <TD>Keyboard Inhibit Switch <BR>1: Keyboard enabled <BR>0: 
                  Keyboard disabled</TD></TR></TBODY></TABLE></CENTER></TD>
          <TD>Port 2 (Output Port): 
            <CENTER>
            <TABLE border=1 cellPadding=2 cellSpacing=0>
              <TBODY>
              <TR>
                <TD>Pin</TD>
                <TD>Name</TD>
                <TD>Function</TD></TR>
              <TR>
                <TD>0</TD>
                <TD>P20</TD>
                <TD>System Reset <BR>1: Normal <BR>0: Reset computer</TD></TR>
              <TR>
                <TD>1</TD>
                <TD>P21</TD>
                <TD><BR>Gate A20 <BR>.</TD></TR>
              <TR>
                <TD>2</TD>
                <TD>P22</TD>
                <TD>Mouse Data: <BR>1: Pull Data low <BR>0: High-Z</TD></TR>
              <TR>
                <TD>3</TD>
                <TD>P23</TD>
                <TD>Mouse Clock: <BR>1: Pull Clock low <BR>0: High-Z</TD></TR>
              <TR>
                <TD>4</TD>
                <TD>P24</TD>
                <TD>Keyboard IBF interrupt: <BR>1: Assert IRQ 1 <BR>0: 
                  De-assert IRQ 1</TD></TR>
              <TR>
                <TD>5</TD>
                <TD>P25</TD>
                <TD>Mouse IBF interrupt: <BR>1: Assert IRQ 12 <BR>0: De-assert 
                  IRQ 12</TD></TR>
              <TR>
                <TD>6</TD>
                <TD>P26</TD>
                <TD>Keyboard Clock: <BR>1: Pull Clock low <BR>0: High-Z</TD></TR>
              <TR>
                <TD>7</TD>
                <TD>P27</TD>
                <TD>Keyboard Data: <BR>1: Pull Data low <BR>0: 
              High-Z</TD></TR></TBODY></TABLE></CENTER></TD>
          <TD>Port 3 (Test Port): 
            <CENTER>
            <TABLE border=1 cellPadding=2 cellSpacing=0>
              <TBODY>
              <TR>
                <TD>Pin</TD>
                <TD>Name</TD>
                <TD>Function</TD></TR>
              <TR>
                <TD>0</TD>
                <TD>T0</TD>
                <TD>Keyboard Clock <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>1</TD>
                <TD>T1</TD>
                <TD>Mouse Clock <BR>(Input) <BR>.</TD></TR>
              <TR>
                <TD>2</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>3</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>4</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>5</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>6</TD>
                <TD>--</TD>
                <TD><BR>Undefined <BR>.</TD></TR>
              <TR>
                <TD>7</TD>
                <TD>--</TD>
                <TD><BR>Undefined 
        <BR>.</TD></TR></TBODY></TABLE></CENTER></TD></TR></TBODY></TABLE></CENTER>
      <P>(Note: Reading keyboard controller datasheets can be confusing--it will 
      refer to the "input buffer" as the "output buffer" and vice versa.&nbsp; 
      This makes sense from the point-of-view of someone writing firmware for 
      the controller, but for somebody used to interfacing the controller, this 
      can cause problems.&nbsp; Throughout this document, I only refer to the 
      "input buffer" as the one containing input from the keyboard, and the 
      "output buffer" as the one that contains output to be sent to the 
      keyboard.) </P>
      <P><I>Status Register:</I> </P>
      <P>The 8042's status flags are read from port 0x64.&nbsp; They contain 
      error information, status information, and indicate whether or not data is 
      present in the input and output buffers.&nbsp; The flags are defined as 
      follows: <BR>&nbsp; </P>
      <CENTER>
      <TABLE border=0 cellPadding=0 cellSpacing=0>
        <TBODY>
        <TR>
          <TD><BR></TD>
          <TD>
            <CENTER>
            <TABLE border=0 cellPadding=3 cellSpacing=0 cols=8 width=400>
              <TBODY>
              <TR>
                <TD>MSb</TD>
                <TD><BR></TD>
                <TD><BR></TD>
                <TD><BR></TD>
                <TD><BR></TD>
                <TD><BR></TD>
                <TD><BR></TD>
                <TD>
                  <DIV align=right>LSb</DIV></TD></TR></TBODY></TABLE></CENTER></TD></TR>
        <TR>
          <TD>AT-compatible mode:</TD>
          <TD>
            <CENTER>
            <TABLE border=1 cellPadding=2 cellSpacing=0 cols=8 width=400>
              <TBODY>
              <TR>
                <TD>
                  <CENTER>PERR</CENTER></TD>
                <TD>
                  <CENTER>RxTO</CENTER></TD>
                <TD>
                  <CENTER>TxTO</CENTER></TD>
                <TD>
                  <CENTER>INH</CENTER></TD>
                <TD>
                  <CENTER>A2</CENTER></TD>
                <TD>
                  <CENTER>SYS</CENTER></TD>
                <TD>
                  <CENTER>IBF</CENTER></TD>
                <TD>
                  <CENTER>OBF</CENTER></TD></TR></TBODY></TABLE></CENTER></TD></TR>
        <TR>
          <TD>PS/2-compatible mode:&nbsp;</TD>
          <TD>
            <CENTER>
            <TABLE border=1 cellPadding=2 cellSpacing=0 cols=8 width=400>
              <TBODY>
              <TR>
                <TD>
                  <CENTER>PERR</CENTER></TD>
                <TD>
                  <CENTER>TO</CENTER></TD>
                <TD>
                  <CENTER>MOBF</CENTER></TD>
                <TD>
                  <CENTER>INH</CENTER></TD>
                <TD>
                  <CENTER>A2</CENTER></TD>
                <TD>
                  <CENTER>SYS</CENTER></TD>
                <TD>
                  <CENTER>IBF</CENTER></TD>
                <TD>
                  <CENTER>OBF</CENTER></TD></TR></TBODY></TABLE></CENTER></TD></TR></TBODY></TABLE></CENTER>
      <UL>
        <LI>OBF (Output Buffer Full) - Indicates when it's okay to write to 
        output buffer. <BR>0: Output buffer empty - Okay to write to port 0x60 
        <BR>1: Output buffer full - Don't write to port 0x60 
        <LI>IBF (Input Buffer Full) - Indicates when input is available in the 
        input buffer. <BR>0: Input buffer empty - No unread input at port 0x60 
        <BR>1: Input buffer full - New input can be read from port 0x60 
        <LI>SYS (System flag) - Post reads this to determine if power-on reset, 
        or software reset. <BR>0: Power-up value - System is in power-on reset. 
        <BR>1: BAT code received - System has already beed initialized. 
        <LI>A2 (Address line A2) - Used internally by the keyboard controller 
        <BR>0: A2 = 0 - Port 0x60 was last written to <BR>1: A2 = 1 - Port 0x64 
        was last written to 
        <LI>INH (Inhibit flag) - Indicates whether or not keyboard communication