外文翻譯--基于單片機(jī)的智能水表的設(shè)計(jì)-單片機(jī)-文庫(kù)吧
2025-04-17 07:24 本頁(yè)面
【正文】 1 series, also had not not patibly, but they unique, became mutually supplementarily, provided the broad world for singlechip application. Looks over singlechip developing process, may indicate singlechip development tendency, has approximately: ⑴ Low power loss CMOS The MCS51 series 8,031 promotes when the power 外文翻譯 3 loss reaches 630mW, but the present singlechip all about 100mW, along with more and more is generally low to singlechip power loss request, the present each singlechip manufacturer basic has all used CMOS (plementary metal oxide semiconductor craft). Looked like 80C51 to use HMOS (namely high density metal oxide pound semiconductor craft) and CHMOS (supplementary high density metal oxide pound semiconductor craft). CMOS although power loss low, but because its physical characteristic decides its working speed insufficiently high, but CHMOS then had has been high speed and the low power loss characteristic, these characteristics, suited in are requesting the low power loss likely battery power supply the application situation. Therefore this kind of craft will be the main way which the next section of times singlechip will develop. ⑵ Miniature monolithic Now the conventional singlechip all is generally the central processor (CPU), the random access data storage (RAM), the readonly program memory (ROM), parallel and the serial munication connection, the interruption system, the timing circuit, the clock electric circuit integration on together the sole chip, the enlargement mode singlechip integrated like A/The D switch, PMW (pulseduration modulation electric circuit), WDT (watchdog), some singlechips (liquid crystal) actuate LCD the electric circuit all to integrate on the sole chip, such singlechip contains unit electric circuit more, the function is more formidable. Even singlechip merchant also may act according to the user requirem the body custom make, makes has oneself characteristic singlechip chip. In addition, present product universal demand volume small, weight light, this requests singlechip strong and the power loss is low besides the function, but also requests its volume to have to be small. Present many singlechips all have the many kinds of seals form, SMD (superficial seal) more and more receives wele, to enable the system which constitutes by singlechip towards the microminiaturized direction to develop. ⑶ .Mainstream and multi varieties coexistence Now although singlechip variety is many, unique, but still as the core singlechip occupies the mainstream take 80C51, the patible its structure and the mand system have PHILIPS 外文翻譯 4 Corporation the product, the ATMEL Corporation39。s product and the Chinese Taiwan39。s Winbond series singlechip. Therefore C8051 was the core singlechip occupied the half of the country. But Microchip Corporation39。s PIC simplified the set of instructions (RISC) also to have the strong development tendency, the Chinese Taiwan39。s HOLTEK Corporation recent years singlechip output grows day by day, if the low price nature superior superiority, occupied a certain market minute volume. In addition also has MOTOROLA Corporation the product, the Japaneseseveral big panies39。 specialpurpose singlechips. In the certain time, this kind of situation will be able to continue, will not have the monopoly aspect which some singlechip unified, will walk will be depends on for existence supplementarily, will plement one another, the munal development path. 二、 intelligent water meter design Longterm since, our country residence water meter are arranged on the indoor kitchen or toilet water concentration, the water more and scattered residences, sometimes even a indoor set more
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