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

void INT_T0() interrupt 1
{
	TH0=(65536-50000)/0x100;
	TL0=(65536-50000)%0x100;
	COUNT++;

	if(COUNT==20)
	{
		COUNT=0x00;
		SECOND++;
		if(SECOND==60)
			SECOND=0;
		P0=TABLE[SECOND/10];	
		P2=TABLE[SECOND%10];
	}
}


main()
{
	SECOND=0x00;
	COUNT =0x00;
	P0=0x3F;
	P2=0x3F;
	TMOD=0x01;
	TH0=(65536-50000)/0x100;
	TL0=(65536-50000)%0x100;
	TR0=1;
	IE=0x82;

	while(1);
}