针对目前使用的RS232接口数字化B超键盘存在PC主机启动时不能设置BIOS，提出一种PS2键盘的设计方法。基于W78E052D单片机，采用8通道串行A/D转换器设计了8个TGC电位器信息采集电路，电位器位置信息以键盘扫描码序列形式发送，正交编码器信号通过XC9536XL转换为单片机可接收的中断信号，软件接收到中断信息后等效处理成按键。结果表明，在满足开机可设置BIOS同时，又可实现超声特有功能，不需要专门设计驱动程序，接口简单，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
上传时间： 2013-10-10
上传用户：asdfasdfd
This project attempts to implement a Database using B+Tree. The project has developed a DATABASE SYSTEM with lesser memory consumption. Its API includes simple SQL Statements and the output is displayed on the screen. Certain applications for which several features of existing databases like concurrency control, transaction management, security features are not enabled. B+Trees can be used as an index for factor access to the data. Help facility is provided to know the syntax of SQL Statements.
标签： project implement developed Database
上传时间： 2013-12-25
上传用户：semi1981
If we have two individually sorted vectors "a" and "b" but they are not sorted with respect to each other and we want to merge them into vector "c" such that "c" is also a sorted vector. Then c=mergesorted(a,b) can be used.
标签： sorted individually respect vectors
上传时间： 2015-09-23
上传用户：comua
Program main BIOS image | | /B - Program Boot Block | | /N - Program NVRAM | | /C - Destroy CMOS checksum | | /E - Program Embedded Controller Block | | /K - Program all non-critical blocks | | /Kn - Program n th non-critical block only(n=0-7) | | /Q - Silent execution | | /REBOOT - Reboot after programming | | /X - Don t Check ROM ID | | /S - Display current system s ROMID | | /Ln - Load CMOS defaults
标签： Program Destroy Block NVRAM
上传时间： 2016-07-26
上传用户：wfl_yy
21世纪大学新型参考教材系列 集成电路B 荒井
上传时间： 2013-04-15
上传用户：eeworm
家电维修(最基础的教程B)1-20.Torrent
上传时间： 2013-06-10
上传用户：eeworm
jk-b交通信号控制机原理图
上传时间： 2013-07-13
上传用户：eeworm
专辑类-实用电子技术专辑-385册-3.609G jk-b交通信号控制机原理图-1.3M.zip
上传时间： 2013-08-02
上传用户：zhf1234
专辑类-电子基础类专辑-153册-2.20G 21世纪大学新型参考教材系列-集成电路B-荒井-159页-2.8M.pdf
上传时间： 2013-05-16
上传用户：pkkkkp
三次B样条曲线源代码,C语言编写的三次B样条曲线源代码，希望大家喜欢。
标签：
上传时间： 2013-07-13
上传用户：chengli008
