用单片机设计交通灯，并要求用LED灯模拟指示东西和南北方向的通行控制，每个方向三种颜色，通行规则遵守一般规则，即“红灯停、绿灯行、黄灯齐止步”。 并且要求交通灯倒计时以秒为单位，两个方向倒计时需用数码管显示当前剩余秒数。

好的，这里是一个基于单片机的交通灯控制器，使用LED灯和数码管来模拟交通灯状态和倒计时：

1. 首先，您需要选择一款适合您的单片机，并且搭建单片机的开发环境（例如Keil或IAR）。

2. 在程序中，您需要定义每个LED灯的状态和颜色，以及每个方向的倒计时时间。您可以使用定时器来控制倒计时，并且在倒计时结束后，自动切换交通灯状态。

3. 您需要编写单片机程序，控制LED灯和数码管的状态，并且实现交通灯的控制逻辑。例如，您可以使用GPIO来控制LED灯的状态，并且使用定时器和数码管来显示倒计时时间。

4. 最后，您需要将单片机程序烧录到单片机上，并且连接LED灯和数码管，以实现交通灯控制器的功能。

以下是一个简单的单片机程序示例，可以帮助您实现交通灯控制器：

#include <reg52.h>

sbit LED_EAST_RED = P1^0;
sbit LED_EAST_YELLOW = P1^1;
sbit LED_EAST_GREEN = P1^2;
sbit LED_NORTH_RED = P1^3;
sbit LED_NORTH_YELLOW = P1^4;
sbit LED_NORTH_GREEN = P1^5;
sbit DISP_DIGIT1 = P2^0;
sbit DISP_DIGIT2 = P2^1;
sbit DISP_SEG_A = P2^2;
sbit DISP_SEG_B = P2^3;
sbit DISP_SEG_C = P2^4;
sbit DISP_SEG_D = P2^5;
sbit DISP_SEG_E = P2^6;
sbit DISP_SEG_F = P2^7;

unsigned char east_green_time = 30;
unsigned char east_yellow_time = 3;
unsigned char east_red_time = 30;
unsigned char north_green_time = 30;
unsigned char north_yellow_time = 3;
unsigned char north_red_time = 30;
unsigned char east_time_left = 0;
unsigned char north_time_left = 0;

void display_time_left(unsigned char time_left) {
    unsigned char digit1 = time_left / 10;
    unsigned char digit2 = time_left % 10;
    DISP_DIGIT1 = 1;
    DISP_SEG_A = 1;
    DISP_SEG_B = 1;
    DISP_SEG_C = 1;
    DISP_SEG_D = 1;
    DISP_SEG_E = 1;
    DISP_SEG_F = 1;
    DISP_DIGIT2 = 1;
    switch (digit1) {
        case 0: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 1: DISP_SEG_B = 0; DISP_SEG_C = 0; break;
        case 2: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 3: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; break;
        case 4: DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_F = 0; break;
        case 5: DISP_SEG_A = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; DISP_SEG_E = 0; break;
        case 6: DISP_SEG_A = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; DISP_SEG_G = 0; break;
        case 7: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; break;
        case 8: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 9: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; break;
    }
    DISP_DIGIT1 = 0;
    switch (digit2) {
        case 0: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 1: DISP_SEG_B = 0; DISP_SEG_C = 0; break;
        case 2: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 3: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; break;
        case 4: DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_F = 0; break;
        case 5: DISP_SEG_A = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; DISP_SEG_E = 0; break;
        case 6: DISP_SEG_A = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; DISP_SEG_G = 0; break;
        case 7: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; break;
        case 8: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_E = 0; DISP_SEG_F = 0; break;
        case 9: DISP_SEG_A = 0; DISP_SEG_B = 0; DISP_SEG_C = 0; DISP_SEG_D = 0; DISP_SEG_F = 0; break;
    }
    DISP_DIGIT2 = 0;
}

void delay(unsigned int ms) {
    unsigned int i, j;
    for (i = 0; i < ms; i++) {
        for (j = 0; j < 114; j++);
    }
}

void main() {
    while (1) {
        // East-West green light
        LED_EAST_GREEN = 1;
        LED_EAST_YELLOW = 0;
        LED_EAST_RED = 0;
        LED_NORTH_GREEN = 0;
        LED_NORTH_YELLOW = 1;
        LED_NORTH_RED = 1;
        east_time_left = east_green_time;
        north_time_left = north_red_time;
        while (east_time_left > 0) {
            display_time_left(east_time_left);
            delay(1000);
            east_time_left--;
        }
        // East-West yellow light
        LED_EAST_GREEN = 0;
        LED_EAST_YELLOW = 1;
        LED_EAST_RED = 0;
        LED_NORTH_GREEN = 0;
        LED_NORTH_YELLOW = 1;
        LED_NORTH_RED = 1;
        east_time_left = east_yellow_time;
        north_time_left = north_red_time;
        while (east_time_left > 0) {
            display_time_left(east_time_left);
            delay(1000);
            east_time_left--;
        }
        // East-West red light
        LED_EAST_GREEN = 0;
        LED_EAST_YELLOW = 0;
        LED_EAST_RED = 1;
        LED_NORTH_GREEN = 0;
        LED_NORTH_YELLOW = 1;
        LED_NORTH_RED = 1;
        east_time_left = east_red_time;
        north_time_left = north_red_time;
        while (east_time_left > 0) {
            display_time_left(east_time_left);
            delay(1000);
            east_time_left--;
        }
        // North-South green light
        LED_EAST_GREEN = 0;
        LED_EAST_YELLOW = 1;
        LED_EAST_RED = 1;
        LED_NORTH_GREEN = 1;
        LED_NORTH_YELLOW = 0;
        LED_NORTH_RED = 0;
        east_time_left = east_red_time;
        north_time_left = north_green_time;
        while (north_time_left > 0) {
            display_time_left(north_time_left);
            delay(1000);
            north_time_left--;
        }
        // North-South yellow light
        LED_EAST_GREEN = 0;
        LED_EAST_YELLOW = 1;
        LED_EAST_RED = 1;
        LED_NORTH_GREEN = 0;
        LED_NORTH_YELLOW = 1;
        LED_NORTH_RED = 0;
        east_time_left = east_red_time;
        north_time_left = north_yellow_time;
        while (north_time_left > 0) {
            display_time_left(north_time_left);
            delay(1000);
            north_time_left--;
        }
        // North-South red light
        LED_EAST_GREEN = 0;
        LED_EAST_YELLOW = 1;
        LED_EAST_RED = 1;
        LED_NORTH_GREEN = 0;
        LED_NORTH_YELLOW = 0;
        LED_NORTH_RED = 1;
        east_time_left = east_red_time;
        north_time_left = north_red_time;
        while (north_time_left > 0) {
            display_time_left(north_time_left);
            delay(1000);
            north_time_left--;
        }
    }
}

希望以上程序可以帮助您实现单片机交通灯控制器。如有疑问，欢迎随时提出。