lcd display the system requires additional configuration

 a highly integrated mixed-signal system-on-chip. It has a 100-pin TQFP package, low power supply voltage of 2.7 ~ 3.3 V, all I / O, RST, JTAG pins are resistant to 5 V voltage; has high speed pipelined 8051-compatible CIP51 core structure (up to 25 MIPS). The MCU has a total of 64 P0 ~ P7 purpose I / O ports, each port pin can be configured as push-pull output or open-drain output. For VGS12864E, due to its operating voltage is 5 V, and C8051F020 operating voltage is 3.3 V, so Character LCD Modules the output C8051F020 better able to drive 5 V input OLED, the system requires lcd display additional configuration. In addition to the corresponding output port is set to "open drain", but also in the circuit will be connected to each port through a pull-up resistor on a 5 V power supply, so you can ensure C8051F020 logic "1" output can be raised to 5 V. The interface circuit shown in Figure 2.
4 software programming
Software programming language using Keil C51 driver includes a display module hardware (ie write commands and write data), and clear screen display module initialization routines as Serial display modules well as other common Western character display realization process. Since this command system and LCD module drive controller HD61202 compatible, so these lcd display procedures have a high versatility. For character character display, character features of the module library data is prepared in the form of columns of data that a byte of data represents the data of an 8 × 1, and compared with the usual character library, the character is rotated by 90 ° font data. Use Zimo21.exe take matrix software, and set the mode to portrait modulo extraction, you can easily obtain the necessary Western text mode.

lcd display congealing used to improve security and reliability

In terms of performance, TFD both the TFT LCD liquid crystal screen and the advantages of the lcd display  screen, TFD LCD is higher than the STN LCD screen brightness, and color is more bright-coloured, more power saving than TFT LCD screen at the same time, but in the color and brightness is worse than TFT LCD.
As TFT technology maturity in the COG LCD Display early ninety s, color LCD flat panel display is developing rapidly, less than 10 years, rapid growth TFT - LCD display for the mainstream, and it has the advantage of this is inseparable. The main features are:
(1) use good features: low voltage application, low driving voltage, congealing used to improve security and reliability; Flat, thin, save a large amount of raw materials and the use of space; Low power consumption, its power consumption is about one over ten of the CRT display, reflection type TFT - only about one percent of the Character LCD Modules lcd display and even save a large amount of energy; TFT - LCD products and specifications, size series, species diversity, convenient and flexible to operate, easy to maintenance, updates, upgrades, long service life and many other features. Display range covered the range from 1 inch to 40 inches all the display and the application scope of the projection plane, is a full size display terminal; Display quality from the simplest monochromatic character graphics to high resolution, high color fidelity, high brightness, high contrast, high response speed of various types of video display; Display mode has a look, projection, type of perspective, there is also a reflection.