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📄 5x系列芯片的复位入口问题.htm

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<p class=MsoNormal><b><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>5x</span></b><b><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>系列芯片的复位入口问题</span></b><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'><br>
</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"'>5x</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>系列的复位入口位于可用程序空间的最高地址，在那里写上一条</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>GOTO&nbsp;MAIN</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>让程序跳到主程序入口。如：</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'><br>
ORG&nbsp;PIC16C54<br>
GOTO&nbsp;MAIN<br>
</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>这些都没有错误。很多书上也是这么写的。</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"'>其实，你可以根本不用管</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>5x</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>系列复位入口的不同，所有程序都从</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>000</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>位置开始写。以</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>57</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>为例，其复位地址是</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>7FFH</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>，空片时此处为</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>FFF</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>，对应指令是</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>&quot;xorlw&nbsp;0xff&quot;</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>，当这条指令执行后，</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>PC</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>加一，为</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>8000H</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>？不是，</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B"'>PC</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>变成</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>000H</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>，在</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B"'>57</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"'>PC</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>只有</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B"'>11</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>位长。类似的，所有</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>5x</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>系列在复位后于程序空间最高处执行一条无关紧要的指令后，回到</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>000</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>处继续执行。</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"'>为什么推荐大家这么做？主要是在一些有片上内部</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>RC</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>振荡的单片机内，如</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>12C508</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>，</span><span lang=EN-US style='font-size:9.0pt;
font-family:"\000B"'>16C505</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>等，在出厂前做了振荡器频率校准，校准值被放在复位入口出，以指令“</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>movlw&nbsp;xx</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>”形式存放。这时，如果你再在该处写指令</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>GOTO&nbsp;MAIN</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>，就会产生冲突。而且，这样写的程序移植性得到提高，程序排列不用做任何修改</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(OPTION/TRIS</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>例外</span><span lang=EN-US style='font-size:
9.0pt;font-family:"\000B"'>)</span><span style='font-size:9.0pt;font-family:
宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>，就可以移植到</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>PIC</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>其它系列的单片机中</span></p>

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