#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code M[3][8]=
{
{0x00,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x00},
{0x00,0x38,0x44,0x54,0x44,0x38,0x00,0x00},
{0x00,0x20,0x30,0x38,0x3c,0x3e,0x00,0x00}
};
uchar i,j;
void main()
{
P0 = 0xff;
P1 = 0xff;
TMOD = 0x01;
TH0 = (65535-2000)/256;
TL0 = (65535-2000)%256;
IT0 = 1;
IE = 0x83;
i = 0xff;
while(1);
}
void Key_Down() interrupt 0
{
P0 = 0xff;
P1 = 0x80;
j = 0;
i = (i+1)%3;
TR0 = 1;
}
void Show_Dot_Matrix() interrupt 1
{
TH0 = (65535-2000)/256;
TL0 = (65535-2000)%256;
P1 = _crol_(P1,1);
P0 = ~M[i][j];
j=(j+1)%8;
}
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