ad 转换　５１编程事例　值得学习以下对出学者有用

STC12系列单片机10位AD转换C语言测试程序-STC12 Series single-chip 10-bit AD conversion C language test program

可调万年历led版:led数码显示时间及温度，时间随时可调。-Adjustable calendar led Edition: led digital display time and temperature, time adjustable at any time.

AT89S51资料，中文版的，很利于大家学习-AT89S51 information, the Chinese version, it is beneficial to them to learn from

SPI是一个环形总线结构，由ss（cs）、sck、sdi、sdo构成，其时序其实很简单，主要是在sck的控制下，两个双向移位寄存器进行数据交换。 假设下面的8位寄存器装的是待发送的数据10101010，上升沿发送、下降沿接收、高位先发送。 那么第一个上升沿来的时候 数据将会是sdo=1；寄存器=0101010x。下降沿到来的时候，sdi上的电平将所存到寄存器中去，那么这时寄存器=0101010sdi，这样在8个时钟脉冲以后，两个寄存器的内容互相交换一次。这样就完成里一个spi时序。 -SPI bus is a ring structure, by ss (cs), sck, sdi, sdo composition, its timing is actually very simple, mainly under the control of the sck and two bi-directional shift register for data exchange. Assuming the following 8-bit register is loaded to send the data to be 10,101,010, rising to send, receive falling edge, high first sent. Well, the first rising edge to the time data will be sdo = 1 register = 0101010x. Falling edge comes, sdi on the level will be stored to the register, then register at this time = 0101010sdi, so 8 clock pulse later, the contents of two registers to exchange time. This will be completed in a spi timing.

The traffic light is timed and lets cars pass during a specific time period. There is a pedestrial crossing button that lets pedestrians cross. The lights are connected to Port 1. You can see this in action using dScope.

按键扫描 51单片机加8279 8279通过74LS 138译码器扩展4×4键盘、6位显示器。 由3-8译码器对SL0～SL2译出键扫描线，由另一3-8译码器译出显示器的位扫描线，并采用了编码扫描方式。 为了防止出现重键现象，扫描输出线高位SL3不参加键扫描译码。CPU对8279的监视采用了查询方式，故8279的中断请求信号IRQ悬空未用。 -Scan button 82,798,279 plus 51 single-chip decoder 74LS 138 through the expansion of 4 × 4 keyboard, the display 6. From 3-8 decoder SL0 ~ SL2 translated to the key scanning line, by another 3-8 decoder translated display scan line, and uses code scanning. In order to prevent the emergence of the phenomenon of re-key, scan the output line does not take part in high level SL3 scan decoding keys. CPU on the 8279 surveillance using the query mode, the 8279 interrupt request signal IRQ left unused.

PCI总线多功能卡的设计,设计内容包括,4路DA输出,6路模拟输入(0-10V),-PCI bus multi-function card design, design elements include, 4-way DA output, 6-channel analog input (0-10V),

本文介绍了一种独特的AVR单片机和计算机进行USB通信的方法-This article describes a unique AVR MCU and USB computer communication methods

这是i Button这种信息纽扣所采用的1线通讯方式的完整源程序。-This is the information i Button Button 1 line used in the complete source code means of communication.

用8051单片机控制的8个LED等的跑马功能，具有花样变化，暂停和变速功能-By 8051 the control of eight LED functions such as horse racing, with pattern changes, suspension and transmission functions