科技论文资料.doc

科技论文 Frequency conversion control system microcontroller peripheral circuit design 系 别 尚德光伏学院 专 业应用电子技术（光电子技术方向） 班 级 0903 学生姓名 高广勇 学 号 090164 指导教师 朱芳 2011年 4 月  Frequency conversion control system micro-controller peripheral circuit design 【 abstract 】 single-chip microcomputer with appropriate peripheral devices and applications, consists of the application system become the minimum system. The article to the frequency conversion control system of the single chip microcomputer buffer circuit design is discussed. 【 key words 】 frequency conversion control; Single chip microcomputer; Buffer circuit This design USES the choice PHILIPS semiconductors company with manual reset function MAX708 products. MAX708 can also monitor the second power signal, as the processor provide voltage drop into warning function, using this function, the system can be in power supply fall to reset before performing some safety operation, save parameters, send warning signals or switching back-up battery, etc. In addition, the system also expanded the programmable peripheral PSD303 chip. Because the system I/O mouth quantity and real ? The product MAX708 that designs to adopt to choose PHILIPS that the semi-conductor companies take to move to reset function.The MAX708 can also keep watch on the second power signal and provide the electric voltage the early-warning function for dropping into for processor and make use of this function, system can when the power drop into to carry out some safety operations before resetting, keep parameter, send out alert signal or cut over spare battery etc.. On top of that, the system expanded programmable outer circle chip PSD303.Because the I of system|the O amount still have a very big margin with actual amount needed, past the system expanded two slices of 8255 Ases again, the one was used for connecting a keyboard and shown el