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#include <AT89X51.H> unsigned char code table[]={0x00,0x01,0x02,0x03,0x04, 0x05,0x06,0x07,0x08,0x09,0x0A}; unsigned char discount,discount2; void delay02s(void) //延时 { unsigned char i,j,k; for(i=20;i>0;i--) for(j=20;j>0;j--) for(k=248;k>0;k--); } void main(void) { int a=0; int b=0; discount=0; discount2=0; P1=discount; while(1) { if(discount==10) { discount=0; discount2++; if(discount2==10) { discount2=0; discount=0; } b=table[discount2]; b=b*16; P1=P1|b; b=b|0x0F; P1=P1&b; } a=table[discount]; P1=P1|a; a=a|0xf0; P1=P1&a; discount++; if(discount2==10) { discount2=0; discount=0; } delay02s();
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