Tiny:2010/12/04 23:03

clock circuit diagram 晴

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TextWith the computer in the social sphere in recent years, the penetration and the development of large scale integrated circuit, microcontroller applications are constantly deepening, because of its powerful function, small size, low power consumption, cheap, reliable, easy to use and so on therefore particularly suited to and control of the system, more and more widely used in automatic control, intelligent instruments, gauges, data acquisition, military products and household appliances and other fields, SCM is often used as a core component in according to the specific hardware architecture, and application-specific software features object combine to make perfect.
Number of sub-clock in their daily lives the most common applications are the most widely used. The number of sub-clock is done microcontroller (AT89C51) as the core, combined with the components (common-cathode LED digital display, BCD - seven segment decoder / driver 74LS48, etc.), which together with the corresponding software, Easy to produce the number of sub- The purpose of the clock, the article mainly from the core hardware design and software programming are two major aspects. Hardware circuit design includes a central processing unit circuit, a digital display circuit, man-machine interface circuit composed of several parts, software, assembly language to achieve. The hardware part of the difficulty lies in the choice of components, layout, and welding.Recent years, the use of singlechip is mo

clock circuit diagram

ving toward deeply with the filter of computer in the society and the development of the large scale integrated circuit. Singlechip is especially equal to the system relation to the control because of its strong funtion, samll volume, low power consumption, inexpensive price, credibility work and its handy.it is used in the area of automata, Intelligent instrument, appearance, data acquisition, production of war industry, domestic appliance and so on.the singlechip is used usually as the centerpiece, It can be perfect bases the specific Hardware infrastructureand aim at the integrated hardware and software device of the specific complexion.
The digital clock is the most familiar and widespin the applications.The singlechip is the hardcore in the digital clock made in this time, the digital clock can reach the purpose of facility digital clock with the correlation parts of an apparatus (common cathode LED nixie display, BCD-seven-segment decoder / drivers74LS48 and so on) and the correspondence software. The heart of the article has two
parts: the hardware design and software programmer. the hardware design includes central processing cell circuit, numeral show circuit, man-machine interface circuit and so on. Software is come true withPigeon bubu [primary four] pigeon bubu [primary four] * TA to TA home to see the charm tribes answered the question: 1 0 / 0 Fast Q Intelligence: 1 0 / 0 Forum activity: 1 0 / 0 answered the adoption rate: 1% (gain 6) 12-12 08:29Evaluation has been closed currently have 0 personal
Are some suggestions: 1. Microcontroller 31 feet (EA VP) received a high potential (VCC) SCM 31 feet to the high potential, it will boot from the internal memory. Take low potential, it will boot from the external memory . Original did not answer the 31 foot, single chip, although it will identify high-potential (Internal weak pull-high). but also more vulnerable to noise interference. boot easier to abnormal 2. Original microcontroller 9 feet (Reset) then a 500 ohm resistor in parallel with a 1uF capacitor to ground. 9 feet into a 10K ohm resistor connected to ground, 9 feet followed by a 1uF capacitor to high voltage (VCC). artwork that access, the microcontroller is not boot reset correctly, so sometimes you can boot, and sometimes not after 3. microcontroller first leg of the 1/2/13 a 10K ohm resistor connected to the high potential (VCC) microcontroller internal Although pull-high resistor. but the external followed by a comparison good. less susceptible to noise interference 4. 74LS244 eight outputs, each must have to access the current limiting resistor. 33 ohm to 50 ohm5. 74LS244 eight input resistance, you can not help me answer 2 hours: 23:19 | to the TA for helpThis is the answer
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