【正文】 he central processing unit (CPU), random access data storage (RAM), readonly program memory (ROM), parallel and serial munication interface, system interruption, timing circuits, integrated circuit clock in a single chip, enhanced singlechip integration, such as A / D converter, PMW (pulse width modulation circuit), WDT (watchdog), and some will be singlechip LCD (LCD) driver integrated circuits are in a single chip, this unit includes singlechip circuits on more and more powerful features. Even singlechip manufacturers can also be tailored in accordance with the requirements of users, to create a single chip with its own chip characteristics. In addition, the product is now the universal demand of small size, light weight, which requires in addition to powerful singlechip and low power consumption, but also its smaller size. Many now have a variety of singlechip package, which SMD (surface mount) is gaining popularity, making the system constituted by the singlechip micromoving in the direction of development. 3. The mainstream and multispecies coexistence Although a wide variety of singlechip, unique, but still singlechip microputer 80C51 2 prevailing at the core, patible with its structure and mand system of PHILIPS products, ATMEL pany39。s Winbond Series Single machine. Therefore, singlechip microputer as the core C8051 occupied the half. Microchip39。s products, several large panies in Japan39。s C 505C, C515C, C167CR, C167CS32FM, 81C90。s 68HC08AZ series. Especially in the C167CS32FM in singlechip, also contains two internal CAN. Therefore, such singlechip works are very easy to pose. Especially in the control system more plicated, the constitute a very useful control work. In order to facilitate the use of variable frequency control of singlechip, to form the most costeffective embedded control systems. Some set up a special singlechip internal control for variable frequency pulse width modulation control circuit, the singlechip microputer has Fujitsu39。 Motorola39。s TC10GP。s SH7410, SH7612 and so on. These are highend singlechip singlechip, MCU is 32 and the DSP 16 or 32bit structure, the frequency of 60MHz or more generally. 2, power consumption, packaging and power supply voltage of the progress Now the new singlechip power consumption is getting smaller and smaller, especially the many singlechip are a variety of work settings, which include waiting, suspended, sleep, idle, powersaving mode and so on. P87LPC762 singlechip pany Philips is a very typical example, in idle, the power consumption is mA, while in powersaving mode, the power consumption is only . In the most amazing power is TI39。s MB89191 ~ 89195, MB89121 ~ 125A, MB89130 series, it should be said that the pany39。s family of operating voltage is as low as 39。 emGateway stronger as a function of the user or server, and it is used to achieve more than the management of embedded devices, as well as standard access the Inter munications, as well as the support of a web browser. Web browsers use to display and embedded emObjicts data transmission between devices. If sufficient resources embedded devices, while at the same time emMicro and emGateway into embedded devices, to achieve direct access to the Inter . Otherwise, it will require a web browser emGateway and each other. EmWare39。s MC68HC08 family of single chip on the use of this technology. Lownoise cabling technology and drive technology In a traditional singlechip, the power and ground wire in the integrated circuit pin symmetric shell, the general is in the upper left, lower right or upper right, lower left of the two pairs of symmetric points. In this way, so that power supply noise on the chip through the block of singlechip interference caused by the internal circuit. Now, put a lot of singlechip power pin arrangement and the two adjacent pins. In this way, not only reduces the current through the entire chip, while still easy to layout printed circuit board decoupling cap