Frecuencymeter digital, clk frequency 10 MHZ, exhibition in 7 segments

it can help you find how to find the soal

ATMEL单片机可用的文件系统源代码，支持FAT16/FAT32格式。-ATMEL SCM available file system source code, support FAT16/FAT32 format.

单片机学习系统附的实验源代码， 有ASM的，有C的，可不能错过哦-SCM learning attached to the experimental system source code, ASM and C, may not be missed oh

MCS-51单片机实验 39个实用实验和源码-MCS-51 Single-chip experiments and practical experiments and 39 source

凌阳061a单片机的中断使用例程。包括外部中断例子-Sunplus 061A MCU interrupt routine use. Including external interrupt example

avr单片机，串口源程序-avr SCM, serial source

车载DVD osdIC TW8816原厂代码-Car DVD osdIC TW8816 original code

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.

LCD12864+51单片机 C语言例程 (此为在主程序，LCD相关函数声明 接口定义位于头文件中)-LCD12864+ 51 Singlechip C language routine (this is in the main program, LCD-related function declaration at the first interface definition file)

用 AT89C51、LED 数码管、按键、二极管等部分构成，能实现时钟日历的功能：能进行时、分的显示。也具有时钟，定时时间的设定，实现三路开关定时输出等功能。-With AT89C51, LED digital tubes, buttons, diodes and other components, to achieve clock calendar function: to carry out, the sub-display. Also has a clock, timer time setting, the realization of three-way开关定时output functions.