Complete Lcd Assembly
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US $29.99
Simple and practical four-line dot matrix LCD drive mode. - The electronics industry.
With the rapid development of science and technology.
Electronic products and much more. More than smart, small, human development of low power and so on. Any increase of the liquid crystal display for creating these needs as possible. The LCD screen can be divided. Strive for the text.
Top British and then a little black or white. Color and other LCD display mostly standard with a separate joint control.
Chip (such as the SED1330, SED1520, HD61202, etc.) occur and facilitate SCM. However, liquid crystal display modules, these parallel and further information call control wired ready for connection. If in practice. Into account the cost of the product and the size of the parallel data lines and control lines to use connected to it, not very easy. Need to take the bus industry standards. I2C, SPI and other compounds, but these are extremely rare. That is, with the form of liquid crystal display module. 74LS164 four lines of the LCD circuit is simple and practical.
A dot-matrix details. LCD module.
This Article describes the control SED1520 chip 122 × 32 dot matrix LCD display, most of which is controlled by the row column drivers. /, And 122 x 32 dot matrix liquid crystal display components full graphic display and can even seven half (16 × 16 dot matrix), the main character variables, technical and visual style are as follows.
Power supply: VDD to +3 V ~ 5 V, external LCD voltage VDD - VLCD = 5.0.
Views: 122 (columns) x 32 points (lines).
Color under the yellow, blue, green? Angle display: 06:00 am open heart.
STN is reflective mode? Drive mode. : 1 / 32 Page 1 / 6 Bias
Current drive. A. Up to 240 first LCD driver module circuit in Figure
LCD Module pin functions shown in the table. 1.
Some send the command table shown in the table. 2.
2 4-point line-matrix LCD driver circuit.
Four Dot matrix LCD driver power lines in Figure 2
The system displays crystal 74LS164 string in and out of the matrix liquid FM12232C by the fourth line connected module. (SDA serial data line, clock line. CLK/A0 series of LCD module data A0. Command line control to enable E1 chip drivers to allow the main line. E2 from the driver chip) to achieve the matrix LCD driver. And liquid crystal display module for connecting the circuit to save compared to the fourth line and connected MCU 2051 of at least seven calls in the mouth of a small electronics Microcontroller port line resources provide valuable products. Personal and intelligent.
LCD screen to control the way in time, so long known as the data in the command module is written while still delay operations are appropriate, then you will not be able to check the status of the module direct control to achieve. Dot-matrix liquid crystal display that corresponds to the point in memory. Bit is set, he will not be clear. Show, as long as the bits of information on display . Control LCD display data stored by the paging file. (See the section of the store information.)
Dump first customers for "E1" or "E2" Sending data to 74LS164 send command / data select signal "A0". Closely together to complete delivery. information and advice to make clear liquid display graphics or text. Etc..
3 Software software with assembler. For space reasons, only send command and data to the module. LCD sub-routine, and letters through the process of beginning and shows how to operate. Subroutine in the subroutine in Chinese characters, lines represented other performances, graphics, animations and fonts. Windows and Graphics Library, Extraction procedure, if necessary, contact the author.
The source code is as follows: a bit of sda. P1.7 the definition of the line. sda.
CLK bit P1.6; The CLK line.
E1 Bit P1.5 the definition of the primary activation.
E2 P1.4 bit definition of slavery enabled.
A0 P1.6 bit; The data / instruction line select
Outmi:; Send suggestions to appear. SED1520 champion.
SETB E1; Master Enable. CLR e2; Close slave LCALL trndata; Send B CLR a0; This Byte command.
CLR E1; ret Off the main road Outsider:; send commands to the display. SED1520 Slave
CLR CLR CLR SETB E1 E2 LCALL trndata e2 a0 Outmd ret:; To send the information to be displayed. SED1520 champion.
E1 E2 LCALL SETB SETB CLR trndata a0 CLR E1 Outsd ret:; to send data to the slave display. SED1520.
Slave Enable CLR E1, E2 core SETB trndata. Close LCALL; Send SETB a0 B, B is set to display data.
CLR e2; Close slave Trndata ret:; on the LCD module bytes.
Push; the original recording.
SETB SDA; Line sda set. SETB CLK; Line CLK SET mov R7, # 08h Trn_loop: RLC CLK CLR MOV SDA, C
SETB CLK DJNZ R7, trn_loop Pop; To restore the original data.
ret init:; of LCD modules.
MOV A, # 0e3h; LCD set outmi LCALL MOV LCALL outsi, # 0aeh; Thrive
LCALL MOV LCALL outmi outsi, # 0a4h; Dynamic Drive.
LCALL. outmi LCALL outsi mov, # 0a9h; refresh rate option. 1 / 32.
outmi LCALL.
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