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单片机P89V51RD2FN

DB. 1#. 2#. 单片机P89V51RD2FN. D 2.0~2.7. D 1.0~1.7. P1.0~P1.7. 74HC373. 74HC373. ___ OE. ___ LEA. ___ OE. ___ LEA. O 1.0~1.7. O 2.0~2.7. P 2.0. P 2.1. 图1.交通灯控制器框架图. O 1.0. O 1.1. O 1.2. O 1.3. NLr. 1#. EMg. 绿. 红r. 绿g. 74HC373. NL. NM. NR. O 1.4. NLg. EMr. 绿.

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单片机P89V51RD2FN

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  1. DB 1# 2# 单片机P89V51RD2FN D2.0~2.7 D1.0~1.7 P1.0~P1.7 74HC373 74HC373 ___ OE ___ LEA ___ OE ___ LEA O1.0~1.7 O2.0~2.7 P2.0 P2.1 图1.交通灯控制器框架图

  2. O1.0 O1.1 O1.2 O1.3 NLr 1# EMg 绿 红r 绿g 74HC373 NL NM NR O1.4 NLg EMr 绿 WR EL O1.5 NMr ELg O2.7 O1.6 WM GND EM O2.6 O1.7 NMg ELr O2.5 WL ER 绿 O2.4 SR SM SL 绿 SLr WMg 2# O2.3 O2.2 O2.1 O2.0 74HC373 注1：因为全程右转，故右转向灯恒绿，红脚接GND，绿脚接VCC,图中未画出。 注2：上图中除地线外所有引脚都需串限流电阻，阻值为红脚串1KΩ绿脚串500Ω时亮度较合适，并且红绿都亮时为黄光；为了画图方便简洁，图中并未画出，请读者自己添加。 注3：符号说明,NESW分别表示北东南西，LMR分别表示左中右，rg分别表示红绿。 SLg WMr SMr WLg SMg WLr 图2.交通灯接线图

  3. 开始 置T1的寄存器 ShowState(Statenumber); 函数的入口参数Statenumber是随该函数的执行次数在循环变化，所以在一个周期内，每一次输出的状态都不一样 主程序框图 置初始常数 开中断 Y 扫描键盘 N 根据既定逻辑输出状态 Count=0 Count=100 Count值判断 调用状态输出函数ShowState(Statenumber); 调用状态输出函数ShowState(Statenumber); 等待 图3

  4. T1入口 置初始常数 Count++ 中断返回 定时程序，每隔50ms中断一次,Count=100时恰好5s，Count=500（即Count=0）时恰好25s 图4

  5. NM/SM NL/SL EM/WM EL/WL 路口传感器模拟按键：当检测到道路空闲时跳转下一状态 1 2 3 4 7 8 5 6 紧急绿灯按键：供特种车辆紧急通过 NM/SM NL/SL EM/WM EL/WL 图5

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