课程设计，有51的定时中断实现交通灯和秒表

#include<reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

uint num=0;
uint start_num=0;
uchar min=0;
uchar sec=0;
uchar return_flag=0;
bit light_red_green=0;//为0时LED1绿灯亮，LED5红灯亮；为1时LED2红灯亮，LED4绿灯亮；
bit light_yellow=0;

sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^3;

sbit led1=P0^4;
sbit led2=P0^5;
sbit led3=P0^6;
sbit led4=P0^7;

sbit L1=P2^0;
sbit L2=P2^1;
sbit L3=P2^2;
sbit L4=P2^3;
sbit L5=P2^4;
sbit L6=P2^5;

sbit dot=P2^7;

void delayMs(uchar ms);
void delayUs(uchar ms);

void LED_display(void);
void traffic_light_display(void);

void init_timer0(void);
void init_timer1(void);
void main (void)
{
while(start_num<200)
{
P0=0x18;
delayMs(1);
P0=0x28;
delayMs(1);
P0=0x48;
delayMs(1);
P0=0x88;
delayMs(1);
start_num++;
delayMs(1);
}
while(1)
{
min=0;
sec=0;
P0=0;