/* Name: Timer control traffic indicator
Note: After the green light is on for 5s, the yellow light flashes and the red light flashes 5 times.
After the red light is on, the north-south direction turns from a red light to a green light, and after 5 seconds, the north-south light flashes.
After 5 flashes, it lights up red, and the east and west lights are bright, so it reciprocates.
*/
#include
#define uchar unsigned char
#define uint unsigned int
Sbit RED_A=P0^0; // east-west indicator
Sbit YELLOW_A=P0^1;
Sbit GREEN_A=P0^2;
Sbit RED_B=P0^3; //North-South direction indicator
Sbit YELLOW_B=P0^4;
Sbit GREEN_B=P0^5;
//Time delay multiple, number of flashes, type of operation
variable
Uchar Time_Count=0, Flash_Count=0, Operation_Type=1;
/ / Timer 0 interrupt function
Void T0_INT() interrupt 1
{
TL0=-50000/256;
TH0=-50000%256;
Switch(Operation_Type)
{
Case 1: / thing to green light and north and south to red light 5s
RED_A=0; YELLOW_A=0; GREEN_A=1;
RED_B=1; YELLOW_B=0; GREEN_B=0;
If(++Time_Count!=100) return; //5s(100*50ms) switch
Time_Count=0;
Operation_Type=2;
Break; 
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