51汇编与C全面周立功

2019-03-24 17:07发布

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书上系统时钟例程能看懂，但后面对该例程的优化看不明白了。怎么将下面这段代码与时钟系统的c程序连接起来呢？我试了好长时间，一直没成功。
CSEG AT 0400H
bcdmap: DB '0' ,'0'
DB '0' ,'1'
DB '0' ,'2'
...
DB '5' ,'7'
DB '5' ,'8'
DB '5' ,'9'
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hfjzy0702
2019-03-25 07:27
原程序中是这样初始化二维数组的。但这样的数组无法定位表头的地址，地址由keil自动编译产生。
uchar code bcdmap[60][2]={
"00", "01","02", "03","04", "05","06", "07","08", "09","10", "11","12", "13","14",
"15","16", "17","18", "19","20", "21","22", "23","24", "25","26", "27","28", "29",
"30", "31","32", "33","34", "35","36", "37","38", "39","40", "41","42", "43","44",
"45","46", "47","48", "49","50", "51","52", "53","54", "55","56", "57","58", "59"};

下面这段汇编代码就能把表头地址定位在ROM区的0400H位置上，缩短主程序查询表格的指令周期。就是用这段汇编代码取代原程序中的C语言定义的方法。 但是不知道怎么把这小段汇编代码与C程序连接起来。

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