单片机
示各种字形或符号。 LED 数码管有共阳、共阴之分。 图是共阳式、共阴式 LED 数码管的原理图和符号。 图 5 共阳式、共阴式 LED 数码管的原理图和数码管的符号图 显示电路显示模块需要实时显示当前的时间 ,即时、分、秒,因此需要 6 个数码管,另需两个数码管来显示横。 采用动态显示方式显示时间,硬件连接如下图所示,时的十位和个位分别显示在第一个和第二个数码管
路设计时常常采用模块化的设计方法。 硬件的设计采用模块化设计,既要满足模块本身功能又要能够和整个系统兼容。 如图 22 所示 ,根据显示系统的功能特点确定系统硬件由显示屏部分,控制部分,通信系统及上位机四部分组成。 上位机通过通信部分向控制部分发送控制指令和显示内容代码,控制部分执行显示指令并将显示代码处理后控制显示部分的显示内容和显示方式。 图 22 系统硬件组成框图 显示屏主控制器
附:简易信号测量仪的 C 语言程序 和原理图 /********************简易信号测量仪的 C 源程序 ***********************/ include //52 单片机的头文件 define uint unsigned int define uchar unsigned char //宏定义 unsigned long int resh_1。 //保存波形的周期
的交流,通常采用显示器作为其输出设备,用于显示输入键值中间信息及运算结果等。 本设计采用常用的发光二极管( LED=Light Emitting Diode)显示器,即 7 段数码管和 LED指示灯。 他们具有耗电省、线路简单、价格低廉、安装方便、耐振动等优点。 我们最常用的是七段式和八段式 LED数码管,八段比七段多了一个小数点,其他的基本相同。 所谓的八段就是指数码管里有八个小 LED
st be strapped to GND in order to enable the device to fetch code from external program memory locations starting at 0000H up to FFFFH. Note, however, that if lock bit 1 is programmed, EA will be
fast speed of electrical machine ring should match close, fasten tasseled phase can be to get very wide frequency band, because of the fast speed ring should be good, dynamic configuration sexual can
l 80S51 product instructions and pin fully patible. Chip Flash allow program memory in system programmable, also suitable for conventional programmer. In a single chip, have dexterous 8 bits CPU and
best meet environmental requirements, for example, chiplevel physical space, largescale integrated circuits lowcost, good peripheral interface bus and outstanding control of instruction. A puter
se frequency can be divided by 4 times or 12 times through setting the value of T3M for PWM0 or T4M for PWM1 in the special register PWMCON as shown in . To PWM0 generator, the clock to 16bit counter
also referred to as a channel control signal / XFER. Figure 23, when the ILE is high, the chip select signal / CS and the write signal / WR1 is low, the input register control signal, in which case,