中断计时函数，最基本的单片机函数，微处理器:AT89S52 编译环境:Keil uVision V2.38a -DHT90 and LCD1602 display of temperature and humidity KeilC procedures file name: DHT90.c microprocessors: AT89S52 compiler environment: Keil uVision V2.38a-Interrupt timer function, basic micro