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基于单片机的电子万年历的设计

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基于单片机的电子万年历的设计

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基于单片机的电子万年历的设计（Design of electronic calendar

based on single chip microcomputer）

This article is contributed by cdled003

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ValueEngineering

63?

Design of electronic calendar based on single chip

microcomputer

ElectronicCalendarDesignBased

Singlechip

Teng Zhenfang TengZhenfang; Zhang Kun Zhang

(Baoding Vocational and Technical College, Baoding 071000)

Kun

(BaodingCollegeofVocationalandTechnical, Baodin9071000,

China)

Abstract: electronic perpetual calendar based on the AT89S52

microcontroller as the core controller, display time, date,

week. Temperature, 12 / 24 for conversion. The whole point of

time and set the alarm function of the king, has a strong

practical value. This paper introduces the design of its

hardware circuit, and gives the flow chart of the main program.

Abstract:Based

Temperature

Thesingleehip.

ElectroniccalendarwithMCUAT89S52microcontroller

Core

Controllerhasthefunctionoftime, date, week,

Display, 12 /

24hourssystemforconversion.OHtimealarmandalarmset.whichhas

Program

Strong

Practicalvalue.Thisarticledescribesthedesign

Ofitshardwareandshowsthemain

Flowchart.

Keywords: AT89S52; single chip microcomputer; clock chip

Keywords:AT89S52; singlechip; clockchip

CLC number: 1P36

Document identifier: A

Article number: 1006431l (20lO) 06006301

With the development of modern large-scale integrated circuit

and single chip microcomputer technology, the electronic

calendar with a number of advanced electronic technology and

modern classic process on behalf of the watch industry leap of

progress, also bring people a lot of convenience. The

electronic calendar based on MCS 51 MCU has the function of

reading time, date, week and temperature, and can be converted

into 12 / 24 time, and the whole point is timely

Set alarm. 1 function and appearance

Year, month, day, hour, minute, second and other time

information, with its own storage time information, 10 years

of lithium batteries. Support 12 / 24 time system, and can use

binary number or BCD code to represent time, can satisfy design

request. The temperature of the chip is digital temperature

sensor DSl8820 of DALLAs company, with a small 3 pin TO 92 volume

package; temperature measurement range is 55 DEG C 125,

temperature resolution can reach 0.0625 degrees, it has unique

1-wire bus interface, MCU port occupied less, can save a lot

of lead and logic circuit. The user set the alarm temperature

stored in the EEPROM, still stored after power down,

Price performance is excellent. The driver chip CH451 is chosen,

it is an integrated digital tube display driver, keyboard scan

control and P monitoring multi function peripheral chip,

built-in RC oscillator circuit, dynamic drive 8 digital tube

or 64 LED light tube, with BCD decoding, flashing, shift and

other functions, can also be 64 key keyboard scanning. The CH451

exchanges data with the microcontroller through a cascaded

serial interface, and provides power on reset and watchdog

functions. The voice chip 1SDl420 is chosen, it uses CMOS

technology, internal oscillator, microphone preamplifier,

automatic gain control, anti aliasing filter, smoothing filter,

speaker driver and EEPROM array. The minimum recording and

playback system requires only microphones, speakers, two

buttons, power supplies, and a few resistors and capacitors.

After the recording and playback operation, the chip

automatically enters the low-power consumption mode, and the

power consumption is only 0.5p, A. According to the design

requirements, this paper selected 1.2 inch dynamic digital tube,

because digital tube segment current is IOMA, average power can

therefore power supply using 220V AC to 5V / lOW. Because the

selection of digital tube operating voltage has 3.6V and 1.8V

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