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利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行 频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ 的信号频率进行准确...
利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ
Embest Arm EduKit II Evaluation Board External Interrupt Test Example Please Select the trigger: 1 - Falling trigg...
interrupt application code * compile : * $/usr/local/arm/2.95.3/bin/arm-linux-gcc -o interrupt interrupt.c ...
The PCA9673 provides general purpose remote I/O expansion for most microcontrollerfamilies vi
The PCA9537 is a 10-pin CMOS device that provides 4 bits of General Purpose parallelInput/Out
The PCA9672 provides general purpose remote I/O expansion for most microcontrollerfamilies vi
The PCA9538 is a 16-pin CMOS device that provides 8 bits of General Purpose parallelInput/Out
单片机时钟设计,定时器T0、T1溢出周期为50MS，T0为秒计数用， T1为调整时闪烁用， P3.7为调整按钮，P1口 为字符输出口，采用共阳显示管。
8051 Serial I/O Routines Ring buffered, interrupt-driven UART driver, written in Keil C .