📄 第四章 keil c51高级编程.htm
字号:
R5<O:P></O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R2 &
R3<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 78.75pt; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
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<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R4～R7<O:P></O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R4～R7<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 78.75pt; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=105>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R1～R3<O:P></O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R1～R3<O:P></O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R1～R3<O:P></O:P></SPAN></P></TD></TR></TBODY></TABLE>
<P class=MsoNormal
style="TEXT-INDENT: 24pt; TEXT-ALIGN: left; tab-stops: 63.0pt"
align=left><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"> <O:P></O:P></SPAN></P>
<P class=MsoNormal
style="TEXT-INDENT: 24pt; TEXT-ALIGN: left; tab-stops: 63.0pt"
align=left><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">(2) 通过固定存储区传递(fixed
memory)<O:P></O:P></SPAN></P>
<P class=MsoBodyTextFirstIndent>这种方法将<SPAN
lang=EN-US>bit型参数传给一个存储段中：</SPAN></P>
<P class=MsoNormal
style="TEXT-INDENT: 24pt; TEXT-ALIGN: left; tab-stops: 63.0pt"
align=left><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN
style="mso-tab-count: 2">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">？<SPAN
lang=EN-US>function_name?BIT<O:P></O:P></SPAN></SPAN></P>
<P class=MsoBodyTextFirstIndent>将其它类型参数均传给下面的段：？<SPAN
lang=EN-US>function_name?BYTE,且按照预选顺序存放。</SPAN></P>
<P class=MsoBodyTextFirstIndent>至于这个固定存储区本身在何处，则由存储模式默认。</P>
<P class=MsoNormal
style="TEXT-INDENT: 24pt; TEXT-ALIGN: left; tab-stops: 63.0pt"
align=left><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">(3)
函数的返回值</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P>
<P class=MsoBodyTextFirstIndent>函数返回值一律放于寄存器中，有如下规律：</P>
<P class=MsoNormal
style="TEXT-INDENT: 24pt; TEXT-ALIGN: left; tab-stops: 63.0pt"
align=left><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"> <O:P></O:P></SPAN></P>
<TABLE
style="MARGIN-LEFT: 32.4pt; BORDER-COLLAPSE: collapse; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt"
cellSpacing=0 cellPadding=0 border=0>
<TBODY>
<TR>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid"
vAlign=top width=156>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">return
type<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 79.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt"
vAlign=top width=106>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">Registev<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 196.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt"
vAlign=top width=262>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">说明</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD></TR>
<TR>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=156>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">bit<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 79.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=106>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">标志位</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 196.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=262>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">由具体标志位返回</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD></TR>
<TR>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=156>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">char/unsigned
char 1_byte指针</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 79.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=106>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R7<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 196.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=262>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">单字节由<SPAN
lang=EN-US>R7返回</SPAN></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD></TR>
<TR>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=156>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">int/unsigned
int 2_byte指针</SPAN><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: windowtext 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 79.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
vAlign=top width=106>
<P class=MsoNormal
style="TEXT-ALIGN: center; tab-stops: 63.0pt"
align=center><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">R6 &
R7<O:P></O:P></SPAN></P></TD>
<TD
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 196.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.75pt solid; mso-border-left-alt: solid windowtext .75pt; mso-border-top-alt: solid windowtext .75pt"
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