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[uCOS] embedded system paper1 DL : 0: 介绍几种cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducing the advanced register based CPU architecture i.e., the MCS 251 microcontroller architecture. The register based CPU supports a 40-byte register file. In addition, the 8xC251SA/SB/SP/SQ microcontroller has 256-Kbyte expanded external code/data memory space and 64-Kbyte stack space. The new controller is also specially designed to execute C code efficiently. More importantly, the 8xC251SA/SB/SP/SQ maintains binary code compatibility with MCS 51 microcontrollers but at the same time allows the use of the powerful MCS 251 microcontroller instruction set, with many new 8, 16 and 32 bit instructions available. The 8xC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip data RAM options and is available in 16 Kbytes and 8 Kbytes of on-chip ROM/OTPROM or ROMless options. -introduced several cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducing the advanced register based CPU architecture ie, the MCS 251 microcontroller architecture. The register based CPU supports a 40-byte register file. In addition, the microcontroller has 8xC251SA/SB/SP/SQ 256-Kbyte expanded external code/data memory space and 64-Kbyte stack space. The new controller is also specially designed to efficiently execute C code. More importantly, the 8xC251SA/SB/SP/SQ maintains binary code compatibility with MCS 51 microcontrollers but at the same time allows the use of the powerful MCS 251 microcontroller instruction set, with many new 8, 16 and 32 bit instructions available. The 8xC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip data
Date : 2026-01-10 Size : 932kb User : 刘市贵
[uCOS] s3c44b0chumoping DL : 0: 当手指或笔触摸屏幕时，平常相互绝缘的两层导电层就在触摸点位置有了一个接触，因其中一面导电层接通X轴方向的5V均匀电压场(图a) ，使得检测层的电压由零变为非零，控制器侦测到这个接通后，进行A/D转换，并将得到的电压值与5V相比即可得触摸点的X轴坐标为（原点在靠近接地点的那端）：Xi=Lx＊Vi / V（即分压原理）同理得出Y轴的坐标，这就是所有电阻技术触摸屏共同的最基本原理。-finger or pen to touch the screen, usually two mutually insulated conductive layer on location in touch with a contact, because either side conductive layer connected to the X-axis 5 V voltage field uniformity (a map), measuring the voltage level from zero to nonzero, the controller connected to the detection of this now, A/D conversion, and the voltage V compared with the five it can touch points for the X axis coordinates (close to the original point of getting access locations) : Xi'an Lx = Vi*/V (ie pressure principle) come empathy Y axis coordinates, This is all technical resistance Touchscreen common basic principles.
Date : 2026-01-10 Size : 63kb User : 简其平
[uCOS] LWIP_TestOK DL : 0: 可直接用于Atmel AT91SAM7X256_EK板的简单Web服务器程序， AT91SAM7X256（MAC)+DM9161AE（PHY），Web程序中设定的IP地址192.168.131.200,MAC地址 00-30-6C－00-00-02详见emac_lib.h与ethernetif.c,可在IE浏览器中输入查看，注：MDIX跳线未短接时，PC与EK板均需要通过UTP网线接至交换机，MDIX短接时可用网线直连PC。-Can be used directly Atmel AT91SAM7X256_EK board a simple Web server program, AT91SAM7X256 (MAC)+ DM9161AE (PHY), Web procedure set IP address of 192.168.131.200, MAC address 00-30-6C-00-00-02 see emac_lib.h and ethernetif.c, in IE browser, enter the view, note: MDIX when the jumper is not shorted, PC and EK boards come through UTP cable connected to the switch, MDIX cable shorted available when Direct Connect PC.
Date : 2026-01-10 Size : 1.5mb User : zxf