微型计算机用于检测、控制系统中,往往要求系统给出定时信号,定时去执行检测、控制任务。其要求间隔时间长短不一,对于间隔时间为微秒级或毫秒级,可用程序等待循环方法来实现,而对间隔时间长,用这种方法,长时间占用主机时间就显得很不经济了,而且程序也很复杂,这就希望硬件系统中有一个简单而使用灵活的可编程序的定时器。我们为南通第二印染厂研制的能耗检测系统,要 Microcomputer for testing, control systems, often require the system to give timing signals, timing to perform testing, control tasks. The requirements of the time interval varies, for the interval of microseconds or milliseconds, the program can wait for the cycle method to achieve, and for a long time interval, in this way, take a long time the host time is very uneconomical, And the program is also very complex, which would like to have a simple and flexible programmable timer in the hardware system. We for Nantong second printing and dyeing plant developed energy consumption testing system, we should