说明：   这是一段利用单片机IO口作的温控程序,感温元件是NTC。功能是，当温度低过某值时开始加热， 随着温度上升。。。当高到某值时停止加热，然后开始冷却。。。不断重复。。。，使用时要注意 RC常数，常数过大会造成16位计数溢出，得不到正确结果。程序是作产品前的一个试验程序，当时 调试已通过，能作到±0.5℃。
(This is a single-chip IO port for the use of temperature control procedures, temperature sensing element is a NTC. Feature is that when the temperature lower than a certain value when heated, with the temperature rise. . . When a high value to a cessation of heating, then start cooling. . . Become repetitive. . . , When attention should be paid to the use of RC constant, constant-off caused by the General Assembly 16 count overflow, not the correct result. Procedures for products of a pilot program before, when the debugger has passed, can be done ± 0.5 ℃.)