【正文】 T is an antijamming technology, which is defined as the sinusoidal signal oscillation circuit outside interference, the waveform will be a variety of Deburring signal superposition, if you use their plastic Schmidt circuit, it will bee a burr trigger signals interfere with the normal clock, in the alternate use of Schmitt circuit and RC filter circuit, it can be eliminated or their role in these gross failure to ensure that the clock signal systems work properly. In this way, a single chip to enhance the reliability of the work. Motorola39。s F2MC8L MCU meet the vast majority of the ~ 6V operating voltage conditions. MSP430X11X and TI39。 Hitachi39。s MB89850 series of panies, MB89860 series。s exclusive singlechip microputer. A certain period of time, this situation will continue to be upheld, there will not be a singlechip monopoly domination, taking the plementary interdependence, plementarity and mon development. Second the technical development of digital singlechip The number of singlechip technology is reflected in the internal structure, power consumption, as well as the external voltage level on the manufacturing process. In these areas, more typically describes the number of singlechip level. At the moment, users need more and more singlechip, but getting higher and higher requirements. The following four areas on which the technological progress that the situation of singlechip microputer. 1, the internal structure of the progress Singlechip integrated inhouse has been an increasing number of parts, these parts include monly used circuits, such as: timers, parators, A / D converter, D / A converters, serial munication interface, Watchdog circuit , LCD controller. Some singlechip control work in order to constitute or form a local work, the internal local area work control module contains the CAN. For example, Infineon39。s products and China Taiwan39。s major chip manufacturing panies have introduced their own singlechip, from the 8, 1632, just to name a few, everything, it is patible with mainstream C51 series of , there are not patible, but they own each other into each other, for SCM applications world wide. Throughout the development process of singlechip, you can indicate the development trend of singlechip, generally are: 1. Lowpower CMOS technology MCS51 series of 8031 introduced the power consumption of 630mW, and now widespread in the singlechip 100mW or so, with the growing demand for lowpower singlechip, and now all the basic singlechip manufacturers are use of CMOS (plementary metal oxide semiconductor process). As the 80C51 on the use of HMOS (high density metal oxide semiconductor process) and CHMOS (highdensity plementary metal oxide semiconductor process). Although the CMOS low power consumption, but because of its physical characteristics to determine its speed is not high enough, and then CHMOS with highspeed and low power consumption characteristics of these features, it is more suitable in low power consumption, as batterypowered applications . Therefore, the process for some time to e will be the main way to develop singlechip 2. Of microchip Now are generally in conventional singlechip will be the 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