proteus设计了一个交通灯进行仿真，为什么LED和数码管都不会亮？

第一次用软件仿真，不太懂为什么不会亮。求教大佬们！！ #include<reg51.h> sbit DIN=P3^0; sbit LOAD=P1^1; sbit CLK=P3^3; sbit south_yellow=P1^1; sbit south_red=P1^2; sbit south_green=P1^0; sbit east_yellow=P0^1; sbit east_red=P0^2; sbit east_green=P0^0; unsigned char minute=0; unsigned char counter=0; unsigned char num_add[]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08}; unsigned char num_dat[]={0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89}; void max7219_send(unsigned char add,unsigned char dat) { unsigned char ADS,i,j; LOAD=0; while(i<16) { if(i<8) { ADS=add; } else { ADS=dat; } for(j=8;j<=1;j--) { DIN=ADS&0x80; ADS=ADS<<1; CLK=1; CLK=0; } i=i+8; } LOAD=1; } void max7219_init() { max7219_send(0x0c,0x01); max7219_send(0x0b,0x07); max7219_send(0x0a,0xf5); max7219_send(0x09,0xff); } void east_display(unsigned char x) { unsigned char i,j; i=x/10; j=x%10; max7219_send(num_add[1],num_dat[j]); max7219_send(num_add[0],num_dat[i]); }void south_display(unsigned char x){ unsigned char i,j; i=x/10; j=x%10; max7219_send(num_add[3],num_dat[j]); max7219_send(num_add[2],num_dat[i]);}void timer_init(){ EA=1; ET0=1; TMOD=0x01; TH0=0xd8; TL0=0xef; TR0=1; counter=0;}void main(){ max7219_init(); timer_init(); while(1);}void traffic() interrupt 1{ if(counter<100) { counter++; } else { counter=0; minute++; if((minute<80)&&(minute>=0)) { east_green=0; east_yellow=1; east_red=1; south_green=1; south_yellow=1; south_red=0; east_display(80-minute); south_display(83-minute); } else if((minute>=80)&&(minute<83)) { east_green=1; east_yellow=0; east_red=1; south_green=1; south_yellow=1; south_red=0; east_display(83-minute); south_display(83-minute); } else if((minute>=83)&&(minute<143)) { east_green=1; east_yellow=1; east_red=0; south_green=0; south_yellow=1; south_red=1; east_display(146-minute); south_display(143-minute); } else if((minute>=143)&&(minute<146)) { east_green=1; east_yellow=1; east_red=0; south_green=1; south_yellow=0; south_red=1; east_display(146-minute); south_display(146-minute); } else { minute=0; } } TH0=0xd8; TL0=0xef; TR0=1;}