📄 来自网友lpc900的——写汇编程序的一些原则.htm
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<P align=left><FONT color=#ff0000 size=4><STRONG><img src=images/face/1.gif ><a href=blog.asp?name=cxjr&subjectid=66>[编程技巧]<a href=more.asp?name=cxjr&id=6512>来自网友LPC900的——写汇编程序的一些原则</a></STRONG></FONT><BR>程序匠人 2005-11-29 12:30:00 <a href=more.asp?name=cxjr&id=6512>阅读全文(928)</a> | <a href=more.asp?name=cxjr&id=6512#comment>回复(0)</a> | <a href=showtb.asp?id=6512 target=_blank>引用(0)</a><BR><FONT face=宋体 size=4><STRONG>[</STRONG></FONT><A href="http://blog.21ic.org/more.asp?name=cxjr&id=6250" target=_blank><FONT face=宋体 color=#ff0000 size=4><STRONG>广告8号位</STRONG></FONT></A><FONT face=宋体 size=4><STRONG>] [</STRONG></FONT><A href="http://blog.21ic.org/more.asp?name=cxjr&id=7705"><U><FONT style="BACKGROUND-COLOR: #000000" face=宋体 color=#ffffff size=4><STRONG>免责声明</STRONG></FONT></U></A><FONT face=宋体 size=4><STRONG>] [</STRONG><A href="http://blog.21ic.com/more.asp?name=cxjr&id=18993"><U><FONT style="BACKGROUND-COLOR: #ffff00" color=#ff0000 size=3><STRONG>请网友来评选最佳队员专栏！</STRONG></FONT></U></A><STRONG>]</STRONG></FONT></P></TD></TR>
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<DIV align=left><P>来自网友LPC900的——写汇编程序的一些原则 </P>
<P>系统寄存器：<BR> A：累加器<BR> B：乘除运算/暂存<BR> C：进位标志/位累加器<BR> DPTR：16位数据指针，访问ROM/XRAM<BR> PC：程序计数器<BR> PSW：程序状态字<BR> R0：8位数据指针，访问IRAM<BR> R1：IRAM堆指针，可用来分配IRAM局部数组<BR> R2,R3：XRAM堆指针，可用来分配XRAM局部数组<BR> SP：栈指针<BR> A、B、C、DPTR、R0、PSW等是自动的，除了ISR外，不必入栈保护<BR>寄存器变量和寄存器参数：<BR> 在子程序调用过程中可以使用R4～R7这4个寄存器作为变量或参数<BR> 寄存器变量按照R4-->R7的顺序分配<BR> 寄存器参数按照R7-->R4的顺序分配<BR> 如果变量或参数超过4个时，则超出的从10H～1FH分配<BR>子程序返回值：<BR> 返回bit型，保存在C中<BR> 返回byte型，保存在R7中<BR> 返回word型，保存在(R6,R7)中<BR>IRAM内存分配：<BR> 00～07：工作寄存器<BR> 08～0F：快中断专用<BR> 10～1F：存储器变量和函数参数<BR> 20～2F：bit、bdata<BR> 30～FF：全局变量、栈、堆</P>
<P>以上只是我写汇编程序的部分原则，相对来说比较合理。 <BR> </P></DIV></TD></TR></TBODY></TABLE><FONT color=#ff0000></FONT>
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