你確定是使用定時器改變頻率？？

下面的程式是使用定時器改變幅值的，你要是確定是定時器改變頻率的話，把具體的要求貼出來

#include

unsigned int i;

code unsigned char Sin[128]={

64,67,70,73,76,79,82,85,88,91,94,96,99,102,104,106,

109,111,113,115,117,118,120,121,123,124,125,126,126,

127,127,127,127,127,127,127,126,126,125,124,123,121,

120,118,117,115,113,111,109,106,104,102,99,96,94,91,

88,85,82,79,76,73,70,67,64,60,57,54,51,48,45,42,39,

36,33,31,28,25,23,21,18,16,14,12,10,9,7,6,4,3,2,1,

1,0,0,0,0,0,0,0,1,1,2,3,4,6,7,9,10,12,14,16,18,21,23,

25,28,31,33,36,39,42,45,48,51,54,57,60};

main()

{

TMOD=0X01;

EA=1;

ET0=1;

TR0=1;

TH0=(65535-1000)/256;

TL0=(65535-1000)%256;

while(1)

{

P1=Sin[i];

}

}

void timer0(void) interrupt 1

{

TH0=(65535-1000)/256;

TL0=(65535-1000)%256;

i=i+1;

if(i==128)i=0;

}