exam6.lst

按下不同的键

C51 COMPILER V7.08   EXAM6                                                                 04/17/2008 15:44:10 PAGE 1   


C51 COMPILER V7.08, COMPILATION OF MODULE EXAM6
OBJECT MODULE PLACED IN exam6.OBJ
COMPILER INVOKED BY: C:\Keil\C51\Bin\c51.exe exam6.c DB SB OE ROM(LARGE) SMALL OT(6,SPEED) WL(2) RB(0)

line level    source

   1          #include "reg51.h"
   2          #include "intrins.h"
   3          #define uchar unsigned char
   4          
   5          sbit L0=P0^0;
   6          sbit L1=P0^1;
   7          sbit L3=P0^2;
   8          sbit L4=P0^3;                   //P2口的0-3都作为输出口。
   9          
  10          void mDelay(unsigned int DelayTime)
  11          { unsigned int j=0;
  12   1      for(DelayTime=2;DelayTime>0;DelayTime--)
  13   1      { for(j=0;j<2;j++)
  14   2      {;} }}
  15          uchar Key()
  16          { uchar KeyV;
  17   1      uchar tmp;
  18   1      //P3=P3|0x3c;                    //四个按键所接位置
  19   1      KeyV=P2;
  20   1      if((KeyV|0xc3)==0xff)           //无键按下。，将读取的P3 口的值KeyV 与0xc3（即11000011B）按位或，如果结果