免费开源实时RTOS

学习单片机的一本比较好的入门书，不但讲述基本的指令操作，典型应用可以作为不错的参考-learning MCU a good entry, not only about the basic operating instructions, a typical application can be used as a good reference

计数综合程序！已经调试通过，拿来就可以使用！-Comprehensive counting procedures! Have been debug is passed, use can use!

The sample software includes, common library, peripheral APIs, and test modules for the APIs. The common library include startup file, standard definition and header files, processor specific setup module, generic interrupt related APIs, timer routine, and scatter loading file. The peripheral directories include, GPIO, PWM, Real-time clock, timer, SPI, I2C, Watchdog timer, UART, external interrupt, etc.

用单片机产生一个振荡信号时，可以用此工具计算器欲求频率时装入的初值-have an MCU oscillation signal, you can use this tool to materialize frequency fashion calculator to the initial value

uart全功能实现.实现如下函数: U_Open, U_Close, U_GetBytes, U_PutBytes, U_GetBytesAvail, U_GetTxRoomLeft, U_PutISRBytes, U_GetTxISRRoomLeft, U_Purge, U_SetOwner, U_SetFlowCtrl, U_ConfigEscape, U_SetDCBConfig, U_CtrlDCD, U_CtrlBreak, U_ClrRxBuffer, U_ClrTxBuffer, U_SetBaudRate, U_SendISRData, U_SendData, U_GetOwnerID, U_SetAutoBaud_Div, /*TY adds these to expand flexibility 2004/10/15*/ U_Register_TX_cb, U_Register_RX_cb, /*TY adds these to let virtual COM port can retrive exception log 2005/3/8*/ U_GetUARTByte, U_PutUARTByte, U_PutUARTBytes, /*for virtual com port to return DCB configuration*/ U_ReadDCBConfig, U_CtrlRI, U_CtrlDTR, U_ReadHWStatus -the realization of full-featured UART. to achieve the following functions: U_Open, U_Close, U_GetBytes, U_PutBytes, U_GetBytesAvail, U_GetTxRoomLeft, U_PutISRBytes, U_GetTxISRRoomLeft, U_Purge, U_SetOwner, U_SetFlowCtrl, U_ConfigEscape, U_SetDCBConfig, U

由89C52与DS1302和4位数码管组成的时钟，可调整。-China man say chinese

Proteus

msp430f169 中断方式驱动4*4矩阵键盘-msp430f169 interrupt-driven 4* 4 matrix keyboard

由8051组成的单片机系统通常情况下，P0口分时复用作为地址、数据总线，P2口提供A15-A8即高8位地址，P3口用作第二功能，只有P1口通常用作I/0口。P1口是8位准双向口，它的每一位都可独立地定义为输入或输出，因此既可作为8位的并行I/O口，也可作为8位的输入输出端。当工作在输入方式时，对应位的锁存器必须先置1,才能正确地读到引脚上的信号,否则,执行读引脚指令时,若对应位的锁存器的值为0，读的结果永远为0。-By 8051, composed of single-chip microcomputer system under normal circumstances, P0 timeshare I reuse as address, data bus, P2 I provide A15-A8 high eight address, P3 mouth for the second function, I usually only P1 for I/0 I. P1 I was eight quasi-two-way port, it can be independent of each and every defined as input or output, it can be used as 8-bit parallel I/O port, can also be used as 8-bit input and output side. When the work in the input, the corresponding bit latch must first buy one in order to correctly read the signal pin, or pin the implementation of reading instruction, if the corresponding bit latch the value of 0, Reading the results of Forever to 0.

51单片机模拟spi串行接口程序，在keilc51下编写-51 single-chip analog spi serial interface procedures keilc51 prepared