1、二、 英文原文 Microcontroller Unit First, the development of simulator Throughout nearly two decades of national development process of simulation technology, according to simulator technology to be used to divide the domestic about the design of simulators can be divided into the following periods: (1) t
2、he late 70s in the mid -80 The technology during this period was mainly the development of simulation systems, now is not high technology, the user request is not high. (2) the late 80s during the late -90 The main use of this period with an emulation function Winbond chip production, the technology
3、 is called Bondout. Using this chip to greatly simplify the design of emulator, so the standard of domestic emulator with a large increase can be largely occupied by the user resources. Simulation performance is due to the increase in domestic production in the emulator nearly 10 years no progress h
4、as been produced using this model. Although individual companies have also tried other techniques to improve the simulation of the standard, for example, HOOKS technology, but because of their technical limitations did not succeed. Instead abroad earlier simulator technology used HOOKS, HOOKS at the
5、 initial stage due to the complexity of the technology itself, simulation performance and price as the domestic use of the simulator Bondout. (3)After 2000 year China in 2000 emulator period changes in the market, the largest, the most striking change is the Winbond W78958 chip simulation of the pro
6、duction. Winbond W78958 chip during the design stage, the internal functions of the simulation only to the production simulator to simulator manufacturers in order to better promote the W78958. After several years of change, however, W78958 simulator evolved into the use of a simulation of the ASIC
7、rather than using the standard chip, the scope of use is limited to domestic and 20,000 a year less than the amount the company also contributed to the Winbond After entering in 2002 announced that it would stop production of the chip. W78958 production, the domestic manufacturers simulator in a ver
8、y embarrassing situation. W78958 use at home as a result of nearly 10 years, the domestic user base is very large, these users will not be able to receive continued support, especially maintenance. In addition, the domestic focus in the W78958 on the technical work done can not be renewed and improv
9、ed, many people in the industry that the industry will face a simulator to set up or re-shuffle of the situation. HOOKS simulator technology is no doubt W78958 manufacturers after the loss of alternatives, but the absence of long-term follow-up and attention, not the short term the majority of manuf
10、acturers of complex HOOKS mature technology products. Experts believe that the overall simulator manufacturers in transition may need 2-3 years of the cycle, and there is considerable simulator manufacturers will be eliminated, the market will have mainly concentrated in a few simulator manufacturer
11、s. Second, the development trend of single-chip It can be said now is a single-chip opinions of the period, the worlds major chip manufacturing companies have introduced their own single-chip, from the 8, 16-32, just to name a few, everything, it is compatible with mainstream C51 series of , there a
12、re not compatible, but they own each other into each other, for SCM applications world wide. Throughout the development process of single-chip, you can indicate the development trend of single-chip, generally are: 1. Low-power CMOS technology MCS-51 series of 8031 introduced the power consumption of
13、 630mW, and now widespread in the single-chip 100mW or so, with the growing demand for low-power single-chip, and now all the basic single-chip manufacturers are use of CMOS (complementary metal oxide semiconductor process). As the 80C51 on the use of HMOS (high density metal oxide semiconductor pro
14、cess) and CHMOS (high-density complementary 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 high-speed and low power consumption characteristics of these features,
15、it is more suitable in low power consumption, as battery-powered applications . Therefore, the process for some time to come will be the main way to develop single-chip 2. Of micro-chip Now are generally in conventional single-chip will be the central processing unit (CPU), random access data storag
16、e (RAM), read-only program memory (ROM), parallel and serial communication interface, system interruption, timing circuits, integrated circuit clock in a single chip, enhanced single-chip integration, such as A / D converter, PMW (pulse width modulation circuit), WDT (watchdog), and some will be sin
17、gle-chip LCD (LCD) driver integrated circuits are in a single chip, this unit includes single-chip circuits on more and more powerful features. Even single-chip manufacturers can also be tailored in accordance with the requirements of users, to create a single chip with its own chip characteristics.
18、 In addition, the product is now the universal demand of small size, light weight, which requires in addition to powerful single-chip and low power consumption, but also its smaller size. Many now have a variety of single-chip package, which SMD (surface mount) is gaining popularity, making the syst
19、em constituted by the single-chip micro-moving in the direction of development. 3. The mainstream and multi-species coexistence Although a wide variety of single-chip, unique, but still single-chip microcomputer 80C51 prevailing at the core, compatible with its structure and command system of PHILIP
20、S products, ATMEL companys products and China Taiwans Winbond Series Single machine. Therefore, single-chip microcomputer as the core C8051 occupied the half. Microchips PIC and reduced instruction set (RISC) has a strong development momentum of China Taiwan HOLTEK single-chip companies in recent ye
21、ars, increasing production, with its high quality low-cost advantages, to occupy a certain market share. MOTOROLA addition to the companys products, several large companies in Japans exclusive single-chip microcomputer. A certain period of time, this situation will continue to be upheld, there will
22、not be a single-chip monopoly domination, taking the complementary interdependence, complementarity and common development. Third, the technical development of digital single-chip The number of single-chip technology is reflected in the internal structure, power consumption, as well as the external
23、voltage level on the manufacturing process. In these areas, more typically describes the number of single-chip level. At the moment, users need more and more single-chip, but getting higher and higher requirements. The following three areas on which the technological progress that the situation of single-chip microcomputer. 1, the internal structure of the progress
