pdf datASHEET 4 p89v51

从PCI一直讲到PCI EXPRESS的文章，对于理解PCI-E的发展历程很有帮助-PCI has been mentioned from the article, PCI EXPRESS, PCI-E for understanding the development process very helpful

Ax88796B的硬件设计原理图，这个文件主要是在x86平台设计的原理图，很有参考价值。-Ax88796B hardware design drawings, This paper mainly in the x86 platform design diagram, of great reference value.

ARM的串口，LED以及PWM裸机程序，对于初学ARM的朋友很有用-ARM" s serial port, LED as well as the PWM bare-metal process, is useful for beginners to use ARM" s friends

用Proteus显示一个从0-9的由数码管构成的键盘（用开关按键控制数字显示）-Proteus and asm

Hex文件格式资料中英文对照 -Hex file format information bilingual

可以用H.264编码解码器源码(c语言)-can use H.264 codec source (c language)

用DriverStudio开发一个USB驱动程序的过程。《10分钟完成一个USB驱动程序》

自摸提取，定时器，输入输出，液晶显示，独立式键盘

USB接口的HID类键盘模拟，通过CH372的外部固件模式，可实实现在WInodws下的即插即用不需要安装驱动。-USB-type keyboard HID interface simulation, through the external CH372 firmware can be used to realize in real WInodws do not need to install plug-and-play drive.

应用背景The CMX990 provides, on-chip: a flexible, formattable GMSK packet and freeformat modem, a dual synthesiser fed from an external source, IF and RF transceiver stages for both Rx and Tx modes, and auxiliary ADCs and DACs for system control and monitoring.关键技术Operating in the range of 400MHz to 1GHz at data rates of 4 to 16 kbps. This single-chip, half-duplex device requires a minimum of external components, keeping end-product board size, power consumption and cost to an absolute minimum. The versatile GMSK modem is configured for either packet and freeformat data operation via an efficient task-oriented Rx and Tx format and command structure combined with data scrambling, interleaving and FEC and CRC capabilities. Rx data acquisition, extraction and tracking functions use Rx data-quality feedback to support varying signal environments. IF and RF functions in the Tx path handle all the signal processing requi