很好的数字电路设计ppt，完整的包含了数字电路设计的所有内容，...

采用一个标准的基准时钟，在单位时间如1S里对被测信号的脉冲数进行计数，即为信号的频率，由于闸门的起始和结束时刻对于信号来说是随机的，将会有脉冲周期的量化误差，进一步分析测量准确度。因此直接测频法只适合测量频率较高的信号，不能满足在整个测量频段内的测量精度保持不变的要求。若要得到整个频段内较高的精确度，应该考虑等精度测量等其他方法。

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ARM9200在LINUX2.4.19下的蜂鸣器驱动程序,经过验证,直接可以应用.-ARM9200 in under the buzzer LINUX2.4.19 driver, after verification, can be applied directly.

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资源描述使用FPGA控制TFT液晶屏，采用Verilog编写FSM控制TFT，控制流程包括TFT的初始化、清屏、显示图片。最主要的是要根据TFT的specification，写好初始化过程。另外还要注意图片显示位置的计算。

凌华工控控制卡PCI-9111计数器采集卡使用例子，全功能-Industrial control card ADLINK PCI-9111 counter examples of the use of acquisition cards, full-featured

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架，其对象容易扩展，可移植性好，支持多个GUI平台的交互开发。现在，Qt/Embedded被广泛地应用于各种嵌入式产品和设备中。-Qt/Embedded is a multi-platform C++ graphical user interface application framework for easy expansion of the target, portability, and support multiple cross-platform GUI development. Now, Qt/Embedded has been widely used in a wide variety of embedded products and devices.

应用背景Logical separation of program and data memory All 8051 devices have specific memory organization, they have separate address spaces for Program (ROM) and Data (RAM) Memory. This logical separation of Memory is useful because it allows the Data Memory to be accessed by 8-bit addresses, which can obviously be more quickly stored and manipulated by an 8-bit CPU. Of course, the l6-bit Data Memory addresses can still be generated with the DPTR register. Program Memory Program Memory can only be read, not written to. The address space for 8051 core is 16- bit, so there is maximum of 64K bytes of Program Memory. Up to 4 Kbytes of Program Memory can be on chip, internal Program Memory of the 8051 core. For access to external Program Memory is used signal PSEN (Program Store Enable). Data Memory Data Memory is on a separate address space than Program Memory. For external Data Memo