RZ-51V20 实例程序

				#include 
				
				typedef   unsigned char  uchar; 
				typedef   unsigned int   uint;
				
				uchar  Count,Sec,shift,n;
				
				uchar code  LEDData[ ] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,
				                          0x82,0xF8,0x80,0x90,0xff};
				uchar data  display[2];
				/********************************************************
				
				主函数
				
				*********************************************************/
				main()
				{
				   P0 = 0xff;            //端口初始化
				   P2 = 0xff;
				   Count = 0x00;
				   Sec = 0x00;
				   n = 0x00;
				   shift = 0xfe;         //送位码初值
				
				   TMOD = 0x01; 
				   TH0 = 0x4c;           //50ms定时 
				   TL0 = 0x00;
				   ET0 = 1; 
				   
				   T2CON = 0x00;         //设置T2CON寄存器
				   TH2 = 0xf8;           //2ms定时
				   TL2 = 0xcc;
				   ET2 = 1;              //启用Timer2中断
				   EA = 1;               //总中断允许
				   TR2 = 1;              //启动定时器2
				   TR0 = 1;              //启动定时器0
				
				   while(1) ; 
				
				}
				
				/*********************************************************
				
				  Timer0中断函数 （负责定时）
				
				**********************************************************/
				void Timer0() interrupt 1 
				{
				   TH0 = 0x4c;               //50ms定时
				   TL0 = 0x00;
				   ++Count;                  //中断计数单元加1
				   if(Count == 20)           //50ms×20＝1s
				   {
				     Count = 0;              //清中断计数单元
				     ++Sec;                  //秒单元加1
				     if(Sec == 100)
				     Sec = 0;                //清秒单元
				   }
				}
				
				/*********************************************************
				
				  Timer2中断函数 （负责数码管显示）
				
				**********************************************************/
				void  timer2() interrupt 5 
				{ 
				   TR2 = 0;
				   TF2 = 0;                      //手工清中断标志  
				   TH2 = 0xf8;                   //2ms定时常数
				   TL2 = 0xcc;
				
				   if(n >= 2)                    //两位数码管显示
				   {
				     n = 0;
				     shift = 0x7f;               //送位码初值
				     P2 = 0xff;                  //关闭显示
				   }
				   else
				   {
				     display[0] = Sec%10;          //个位
				     display[1] = Sec/10;          //十位
				
				     P0 = LEDData[display[n++]];   //送段码
				     P2 = shift;                   //送位码
				     shift = (shift>>1)|0x80;      //调整位码
				   }
				   TR2 = 1;
				}
				
				/**********************************************************/