📄 1c51中ram的地址分配.htm
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<div class=Section1 style='layout-grid:15.6pt'>
<p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>C51</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>中</span><span lang=EN-US style='font-size:9.0pt;
font-family:"\000B "'>RAM</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>的地址分配</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'><br>
<br>
</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>如果只使用了一片</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>RAM</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>，比如地址从</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>2000H~3FFFH</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>，那么问题就简单一些，只要在</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>Option/BL51 Locate/XDATA</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>之中添上</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>0x2000 - 0x3FFF</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>即可，所有没有指定位置的</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>XDATA</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>都会被自动的分配到这个区间。</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'><br>
<br>
</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>如果</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>RAM</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>的分配比较复杂，那么建议用</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>#pragma src</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>生成汇编文件，查看该数组的</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>XDATA</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>属性的</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>RSEG</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>名字，假定是：</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'><br>
?XD?I SEGMENT XDATA <br>
RSEG ?XD?I<br>
aCharPattern: DS 618<br>
</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>那么在上面的位置填入：</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B "'>?XD?I (0x2000)<br>
<br>
</span><span style='font-size:9.0pt;font-family:宋体;
mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>具体的意义参见</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>Keil</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>附带的</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>A51.PDF</span><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>或</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B "'>U51.PDF</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B ";
mso-hansi-font-family:"\000B "'>有关</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B "'>BL51</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B ";mso-hansi-font-family:"\000B "'>的章节。</span></p>
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