书签分享收藏举报版权申诉 / 27

立即下载

当前位置：首页 > 教育专区 > 高考资料 > 51单片机C语言编程基础及实例[收.pdf

51单片机C语言编程基础及实例[收.pdf

上传人：H****o

文档编号：56608781

上传时间：2022-11-02

格式：PDF

页数：27

大小：376.48KB

( 4.5 )

《51单片机C语言编程基础及实例[收.pdf》由会员分享，可在线阅读，更多相关《51单片机C语言编程基础及实例[收.pdf（27页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、51 单片机 C 语言编程基础及实例时间:2008-01-08 来源:作者:点击：80792 字体大小:【大中小】基础知识：51 单片机编程基础第一节：单数码管按键显示第二节：双数码管可调秒表第三节：十字路口交通灯第四节：数码管驱动第五节：键盘驱动第六节：低频频率计第七节：电子表第八节：串行口应用基础知识：51 单片机编程基础单片机的外部结构：1.DIP40 双列直插；2.P0，P1，P2，P3 四个 8 位准双向I/O 引脚；（作为 I/O 输入时，要先输出高电平）3.电源 VCC（PIN40）和地线GND（PIN20）；4.高电平复位RESET（PIN9）；（10uF 电容接 VCC与

2、 RESET，即可实现上电复位）5.内置振荡电路，外部只要接晶体至X1（PIN18）和 X0（PIN19）；（频率为主频的12 倍）6.程序配置EA（PIN31）接高电平VCC；（运行单片机内部ROM 中的程序）7.P3 支持第二功能：RXD、TXD、INT0、INT1、T0、T1 单片机内部I/O 部件：(所为学习单片机，实际上就是编程控制以下I/O 部件，完成指定任务)1.四个 8 位通用 I/O 端口，对应引脚P0、P1、P2 和 P3；2.两个 16 位定时计数器；（TMOD，TCON，TL0，TH0，TL1，TH1）3.一个串行通信接口；（SCON，SBUF）4.一个中断控制器；（I

3、E，IP）针对 AT89C52 单片机，头文件AT89x52.h 给出了 SFR 特殊功能寄存器所有端口的定义。C 语言编程基础：1.十六进制表示字节0 x5a：二进制为01011010B；0 x6E 为 01101110。2.如果将一个16 位二进数赋给一个8 位的字节变量，则自动截断为低8 位，而丢掉高8 位。3.+var表示对变量var 先增一；var 表示对变量后减一。4.x|=0 x0f;表示为x=x|0 x0f;5.TMOD=(TMOD&0 xf0)|0 x05;表示给变量TMOD 的低四位赋值0 x5，而不改变TMOD 的高四位。6.While(1);表示无限执行该语句，即死循环

4、。语句后的分号表示空循环体，也就是;在某引脚输出高电平的编程方法：（比如 P1.3（PIN4）引脚）代码1.#include /该头文档中有单片机内部资源的符号化定义，其中包含P1.3 2.void main(void )/void 表示没有输入参数，也没有函数返值，这入单片机运行的复位入口3.4.P1_3=1;/给 P1_3 赋值 1，引脚 P1.3就能输出高电平VCC 5.While(1);/死循环，相当 LOOP:goto LOOP;6.注意：P0 的每个引脚要输出高电平时，必须外接上拉电阻（如4K7）至 VCC 电源。在某引脚输出低电平的编程方法：（比如 P2.7 引脚）代码1.#in

5、clude /该头文档中有单片机内部资源的符号化定义，其中包含P2.7 2.void main(void)/void 表示没有输入参数，也没有函数返值，这入单片机运行的复位入口3.4.P2_7=0;/给 P2_7 赋值 0，引脚 P2.7就能输出低电平GND 5.While(1);/死循环，相当 LOOP:goto LOOP;6.在某引脚输出方波编程方法：（比如 P3.1 引脚）代码1.#include /该头文档中有单片机内部资源的符号化定义，其中包含P3.1 2.void main(void )/void 表示没有输入参数，也没有函数返值，这入单片机运行的复位入口3.4.While(1)/

6、非零表示真，如果为真则执行下面循环体的语句文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3

7、N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH

8、3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 H

9、H3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10

10、HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10

11、 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H1

12、0 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L35.6.P3_1=1;/给 P

13、3_1 赋值 1，引脚 P3.1就能输出高电平VCC 7.P3_1=0;/给 P3_1 赋值 0，引脚 P3.1就能输出低电平GND 8./由于一直为真，所以不断输出高、低、高、低，从而形成方波9.将某引脚的输入电平取反后，从另一个引脚输出：（比如P0.4=NOT(P1.1)）代码1.#include /该头文档中有单片机内部资源的符号化定义，其中包含P0.4和 P1.1 2.void main(void)/void 表示没有输入参数，也没有函数返值，这入单片机运行的复位入口3.4.P1_1=1;/初始化。P1.1作为输入，必须输出高电平5.W hile(1)/非零表示真，如果为真则执行下面循

14、环体的语句6.7.i f(P1_1=1)/读取 P1.1，就是认为P1.1为输入，如果P1.1输入高电平VCC 8.P0_4=0;/给 P0_4 赋值 0，引脚 P0.4就能输出低电平GND 9.else/否则 P1.1输入为低电平GND 10./P0_4=0;/给 P0_4 赋值 0，引脚 P0.4就能输出低电平GND 11.P0_4=1;/给 P0_4 赋值 1，引脚 P0.4就能输出高电平VCC 12./由于一直为真，所以不断根据P1.1的输入情况，改变P0.4的输出电平13.将某端口8 个引脚输入电平，低四位取反后，从另一个端口8 个引脚输出：（比如P2=NOT(P3)）代码1.#in

15、clude /该头文档中有单片机内部资源的符号化定义，其中包含P2 和 P3 2.void main(void )/void 表示没有输入参数，也没有函数返值，这入单片机运行的复位入口3.4.P3=0 xff;/初始化。P3 作为输入，必须输出高电平，同时给P3 口的 8 个引脚输出高电平5.While(1)/非零表示真，如果为真则执行下面循环体的语句6./取反的方法是异或1，而不取反的方法则是异或0 7.P2=P30 x0f/读取 P3，就是认为P3 为输入，低四位异或者1，即取反，然后输出8./由于一直为真，所以不断将P3 取反输出到P2 9.文档编码:CK2C6J1E4H10 HH3N5

16、B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N

17、5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3

18、N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH

19、3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 H

20、H3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10

21、HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10

22、 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3注意：一个字节的8 位 D7、D6 至 D0，分别输出到P3.7、P3.6 至 P3.0，比如 P3=0 x0f，则

23、P3.7、P3.6、P3.5、P3.4 四个引脚都输出低电平，而P3.3、P3.2、P3.1、P3.0 四个引脚都输出高电平。同样，输入一个端口 P2，即是将P2.7、P2.6 至 P2.0，读入到一个字节的8 位 D7、D6 至 D0。第一节：单数码管按键显示单片机最小系统的硬件原理接线图：1.接电源：VCC（PIN40）、GND（PIN20）。加接退耦电容0.1uF 2.接晶体：X1（PIN18）、X2（PIN19）。注意标出晶体频率（选用12MHz），还有辅助电容30pF 3.接复位：RES（PIN9）。接上电复位电路，以及手动复位电路，分析复位工作原理4.接配置：EA（PIN31）。说

24、明原因。发光二极的控制：单片机I/O 输出将一发光二极管LED 的正极（阳极）接P1.1，LED 的负极（阴极）接地GND。只要 P1.1 输出高电平VCC，LED 就正向导通（导通时LED 上的压降大于1V），有电流流过LED，至发 LED 发亮。实际上由于 P1.1 高电平输出电阻为10K，起到输出限流的作用，所以流过 LED 的电流小于（5V-1V）/10K=0.4mA。只要 P1.1 输出低电平GND，实际小于0.3V，LED 就不能导通，结果LED 不亮。开关双键的输入：输入先输出高一个按键 KEY_ON 接在 P1.6 与 GND 之间，另一个按键KEY_OFF 接 P1.7 与

25、GND 之间，按 KEY_ON 后LED 亮，按 KEY_OFF 后 LED 灭。同时按下LED 半亮，LED 保持后松开键的状态，即ON 亮 OFF 灭。代码1.#include 2.#define LED P11 /用符号 LED 代替 P1_1 3.#define KEY_ON P16 /用符号 KEY_ON 代替 P1_6 4.#define KEY_OFF P17 /用符号 KEY_OFF 代替 P1_7 5.void main(void)/单片机复位后的执行入口，void表示空，无输入参数，无返回值6.7.KEY_ON=1;/作为输入，首先输出高，接下KEY_ON，P1.6则接地为

26、 0，否则输入为1 8.KEY_OFF=1;/作为输入，首先输出高，接下KEY_OFF，P1.7则接地为 0，否则输入为1 9.While(1)/永远为真，所以永远循环执行如下括号内所有语句10.11.if(KEY_ON=0)LED=1;/是 KEY_ON 接下，所示P1.1输出高，LED 亮12.if(KEY_OFF=0)LED=0;/是 KEY_OFF 接下，所示P1.1输出低，LED 灭文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H1

27、0 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H

28、10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4

29、H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E

30、4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1

31、E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J

32、1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6

33、J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L313./松开键后，都不给LED 赋值，所以LED 保持最后按键状态。14./同时按下时，LED 不断亮灭，各占一半时间，交替频率很快，由于人眼惯性，看上去为半亮态15.数码管的接法和驱动原理一支七段数码管实际由8 个发光二极管构成，其中7 个组形构成数字8 的七段笔画，所以称

34、为七段数码管，而余下的1 个发光二极管作为小数点。作为习惯，分别给8 个发光二极管标上记号：a,b,c,d,e,f,g,h。对应 8 的顶上一画，按顺时针方向排，中间一画为g，小数点为h。我们通常又将各二极与一个字节的8 位对应，a(D0),b(D1),c(D2),d(D3),e(D4),f(D5),g(D6),h(D7)，相应 8 个发光二极管正好与单片机一个端口Pn 的 8 个引脚连接，这样单片机就可以通过引脚输出高低电平控制8 个发光二极的亮与灭，从而显示各种数字和符号；对应字节，引脚接法为：a(Pn.0)，b(Pn.1)，c(Pn.2)，d(Pn.3)，e(Pn.4)，f(Pn.5)，

35、g(Pn.6)，h(Pn.7)。如果将 8 个发光二极管的负极（阴极）内接在一起，作为数码管的一个引脚，这种数码管则被称为共阴数码管，共同的引脚则称为共阴极，8 个正极则为段极。否则，如果是将正极（阳极）内接在一起引出的，则称为共阳数码管，共同的引脚则称为共阳极，8 个负极则为段极。以单支共阴数码管为例，可将段极接到某端口Pn，共阴极接GND，则可编写出对应十六进制码的七段码表字节数据如右图：16 键码显示的程序我们在 P1 端口接一支共阴数码管SLED，在 P2、P3 端口接 16 个按键，分别编号为KEY_0、KEY_1 到KEY_F，操作时只能按一个键，按键后SLED 显示对应键编号。代

36、码1.#include 2.#define SLED P1 3.#define KEY_0 P20 4.#define KEY_1 P21 5.#define KEY_2 P22 6.#define KEY_3 P23 7.#define KEY_4 P24 8.#define KEY_5 P25 9.#define KEY_6 P26 10.#define KEY_7 P27 11.#define KEY_8 P30 12.#define KEY_9 P31 13.#define KEY_A P32 14.#define KEY_B P33 文档编码:CK2C6J1E4H10 HH3N5B4

37、Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B

38、4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5

39、B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N

40、5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3

41、N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH

42、3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 H

43、H3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L315.#define KEY_C P34 16.#define KEY_D P35 17.#define KEY_E P3

44、6 18.#define KEY_F P37 19.Code unsigned char Seg7Code16=/用十六进数作为数组下标，可直接取得对应的七段编码字节20./0 1 2 3 4 5 6 7 8 9 A b C d E F 21.0 x3f,0 x06,0 x5b,0 x4f,0 x66,0 x6d,0 x7d,0 x07,0 x7f,0 x6f,0 x77,0 x7c,0 x39,0 x5e,0 x79,0 x71;22.void main(void )23.24.unsigned char i=0;/作为数组下标25.P2=0 xff;/P2作为输入，初始化输出高26.P3=

45、0 xff;/P3作为输入，初始化输出高27.While(1)28.29.if(KEY_0=0)i=0;if(KEY_1=0)i=1;30.if(KEY_2=0)i=2;if(KEY_3=0)i=3;31.if(KEY_4=0)i=4;if(KEY_5=0)i=5;32.if(KEY_6=0)i=6;if(KEY_7=0)i=7;33.if(KEY_8=0)i=8;if(KEY_9=0)i=9;34.if(KEY_A=0)i=0 xA;if(KEY_B=0)i=0 xB;35.if(KEY_C=0)i=0 xC;if(KEY_D=0)i=0 xD;36.if(KEY_E=0)i=0 xE;if

46、(KEY_F=0)i=0 xF;37.SLED=Seg7Code i;/开始时显示0，根据 i 取应七段编码38.39.第二节：双数码管可调秒表解：只要满足题目要求，方法越简单越好。由于单片机I/O 资源足够，所以双数码管可接成静态显示方式，两个共阴数码管分别接在P1（秒十位）和P2（秒个位）口，它们的共阴极都接地，安排两个按键接在P3.2（十位数调整）和 P3.3（个位数调整）上，为了方便计时，选用 12MHz 的晶体。为了达到精确计时，选用定时器方式2，每计数 250 重载一次，即 250us，定义一整数变量计数重载次数，这样计数4000 次即为一秒。定义两个字节变量 S10 和 S1 分

47、别计算秒十位和秒个位。编得如下程序：文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B

48、4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5

49、B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N

50、5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3N5B4Z5J10 ZQ3D10X3R1L3文档编码:CK2C6J1E4H10 HH3

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

4.3 金币

版权申诉 word格式文档无特别注明外均可编辑修改；预览文档经过压缩，下载后原文更清晰！ 立即下载

配套讲稿：: 如PPT文件的首页显示word图标，表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
特殊限制：: 部分文档作品中含有的国旗、国徽等图片，仅作为作品整体效果示例展示，禁止商用。设计者仅对作品中独创性部分享有著作权。
关键词：: 51 单片机语言编程基础实例

淘文阁 - 分享文档赚钱的网站所有资源均是用户自行上传分享，仅供网友学习交流，未经上传用户书面授权，请勿作他用。

限制150内

关于本文

本文标题：51单片机C语言编程基础及实例[收.pdf
链接地址：https://www.taowenge.com/p-56608781.html