📄 mega8学习笔记（2）-------cocoguojia 原创--单片机实验室－－－－－嘉哥.htm
字号:
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">PORTB</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">等）</SPAN><SPAN
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style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 115.5pt; TEXT-INDENT: -115.5pt; mso-char-indent-count: -11.0"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">PINX:</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">输入引脚寄存器</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><SPAN
style="mso-spacerun: yes"><FONT
face="Times New Roman">
</FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">无论</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">DDRX:</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">的设置如何，此寄存器都反应外部</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">IO</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">上的实际电平的高低（这个是大部分单片机没有的，有了这个寄存器可以实现真正的读</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">--</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">修改</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">--</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">写）</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 115.5pt; TEXT-INDENT: -115.5pt; mso-char-indent-count: -11.0"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">DDRX:</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">方向寄存器</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><SPAN
style="mso-spacerun: yes"><FONT
face="Times New Roman">
</FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">为</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">1</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">时输出</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><SPAN
style="mso-spacerun: yes"><FONT
face="Times New Roman"> </FONT></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">为</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">0</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">是输入（和</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">PIC</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">正好相反）</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">其中</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">X</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">为（</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">A B C D</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">）</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">在注意一下</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">IO</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">状态的设置，见</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">P68 </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">的表格；在读取</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">PINX</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">的时候必要的时候要有一点延时后在读，参见</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">P69 </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">的图</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">从</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">P64 </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">看到</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">P70 </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">就行了，其它的暂时不看</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">看完了，</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">OK</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">，现在就用</SPAN><SPAN
lang=EN-US style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman">CVAVR</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">来编写最小系统、流水灯、按键检测</SPAN><SPAN
style="mso-bidi-font-size: 10.5pt"><FONT
face="Times New Roman"> </FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">的程序吧！要多动手哦！</SPAN><SPAN
lang=EN-US
style="mso-bidi-font-size: 10.5pt"><o:p></o:p></SPAN></P>
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