main.c

《Proteus在MCS-51&ARM7系统中的应用百例》逆向之 Chapter 5 《Proteus在MCS-51&ARM7系统中的应用百例》MCS-51例子的C语言版本。

#include <reg51.h>
typedef unsigned char BYTE;

BYTE SECOND;
BYTE TCOUNT;
BYTE KCOUNT;

BYTE code TABLE[]={	0x3F,0x06,0x5B,0x4F,0x66,
					0x6D,0x7D,0x07,0x7F,0x6F}; 

sbit KEY=P3^7;

void INT_T0()	interrupt 1
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	TCOUNT++;
	if(TCOUNT==2)
	{
		TCOUNT=0x00;
		SECOND++;
		if(SECOND==100)
			SECOND=0x00;	
	}

	P0=TABLE[SECOND/10];
	P2=TABLE[SECOND%10];
} 


void DELAY()
{
	BYTE i=20;

	do
	{
		BYTE j=250;
		do
		{}while(--j);
	}while(--i);
}


main()
{
	while(1)
	{
		P0=0x3F;
		P2=0x3F;
		SECOND=0x00;
		TCOUNT=0x00;
		KCOUNT=0x00;
	   	TMOD  =0x01;
		TL0=(65536-50000)/256;
		TH0=(65536-50000)%256;
	
		while(1)
		{
			while(KEY);
			DELAY();
			while(KEY);
		
			if(KCOUNT==0x00)
			{
				TR0=1;
				IE=0x82;
				while(!KEY);
				KCOUNT++;
			}
			else if(KCOUNT==0x01)
			{
				TR0=0;
				IE=0x00;
				while(!KEY);
			   	KCOUNT++;
			}
			else if(KCOUNT==0x02)
			{
				while(!KEY);
				break;	
			}
		}
	}
	

}