Summary: Use embedded Proteus of emulation platform of design of systematic soft hardware rolls to dot matrix LED Chinese display screen undertakes emulation designing, finished hardware circuit design of the system and software process designing, undertook emulation debugging, realized a Chinese character to show in dot matrix LED the scroll on screen shows, achieved the goal of emulation design.
Keyword: Emulate; Proteus; Show; Latticedot matrix
1. Foreword
The Chinese display screen that dot matrix LED forms is in public applying very extensive. For example, the stock price in hall of clew of time of station hair car, stock shows board, the mobile advertisement column of bazaar, takeoff schedule that states engine office. The characteristic of latticedot matrix monitor is OK undertake assorted according to the size of need, appearance and color, with sheet piece engine control executes all sorts of characters or graph change, achieve the goal that advertisement is publicized and hints.
Proteus is novel embedded design of systematic soft hardware emulates platform, special apply to sheet piece machine emulate, can what emulate a variety of types in real time is online, odd a machine, set of such as MCS-51 is single a machine, PIC is odd a machine, AVR is odd a machine, can undertake like hardware emulator soft hardware is debugged, and the emulator that does not have necessary flower money to buy and safeguard the price not to poor, odd to begin to learn for the person of a machine, decreased to learn cost already, achieved favorable study result again.
2. Hardware circuit is designed
If the graph is shown 1 times,circuit of hardware of screen of Chinese display of scroll of dot matrix LED designs block diagram. Circuit includes sheet piece circuit of machine, power source, clock circuit, restoration circuit, drive circuit and LED lattice circuit. The core of this design is to use sheet piece machine read take indication word yard, undertake to lattice of 16 × 16LED through drive circuit trends lists scanning, show in order to realize the scroll of the Chinese character. What this design chooses is odd a machine the AT89C52 that is ATMEL company, indication screen uses lattice of 16 × 16LED. Power source circuit is sheet through transformation commutate component piece the 5V job voltage that machine and other circuit provide stability. Clock circuit is odd the drive circuit of a machine, restoration circuit can be when need, the hand is moved make odd a to clear of restoration of engine order tally. Through direction of zincous drive report 16 × at 16 o'clock blast send word stack, this design uses 74LS273. Be opposite through cathode drive circuit 16 × at 16 o'clock blast scan into cavalcade, this design uses 74HC138.
Graph 1 hardware circuit designs block diagram
Use Proteus software to design dot matrix LED to roll if the graph is shown 2 times,principle of circuit of hardware of Chinese display screen pursues. In Proteus software, odd itself included an engine model working power source and changeable working frequency, because this need not design power source circuit and clock circuit when emulate. Those who need a specification is to be in Proteus software is returned in version at present without 16 × at 16 o'clock blast module, the existing 8 × in Proteus software is being used in this design at 8 o'clock blast module group synthesizes a 16 × at 16 o'clock blast module. From the graph 2 in can see, 16 × at 16 o'clock blast zincous drive is formed by 74LS273 of bumper of output of P0 mouth classics, in this design need uses two, send travel and on 8 below 8 words stack respectively. 16 × at 16 o'clock blast cathode drive is scanned by the trends after coding of 74HC138 of P2 mouth classics 16 × at 16 o'clock blast each, 4 74HC138 encoder needs in this design, circular scanning is listed each, show a whole Chinese character needs to scan 32 times. RP3 is a block, contain 8 resistor, of everybody of the mouth that make P0 on help resistance, in order to make sure P0 mouth can output tall n. The action of restoration circuit is, in any hour can the hand uses restoration sheet piece machine, make the program is carried out afresh.
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