p15_1.c

单片机原理与应用实例教程 单片机原理与应用实例教程

#include "REG51.H"
sbit SPK = P2^3;
unsigned char S_TH[] = {
	0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE };
unsigned char S_TL[] = {
	0x44, 0xAC, 0x09, 0x34, 0x82, 0xC8, 0x06, 0x22 };
unsigned char Tone = 0;

void Delay( int n )
{
	int i, j;
	for( i = 0; i < n; i ++ )
	{
		for( j = 0; j < 10; j ++ )
		{
		}
	}
}	   //dsf sdfsdf
void INT_TO(void) interrupt 1
{
	SPK = !SPK;
	TH0 = S_TH[Tone];
	TL0 = S_TL[Tone];
}
main()
{
	TMOD = 0x01;
	TH0	= S_TH[Tone];
	TL0	= S_TL[Tone];
	SPK	= 0;
	EA	= 1;
	ET0	= 1;
	TR0 = 1;
	while(1)
	{
		Tone ++;
		if( Tone == 8 )
			Tone = 0;
		Delay(5000);
	}
}