lcd1602 is an industrial character LCD, i.e., capable of displaying 32 characters simultaneously 16x02. lcd1602 lcd1602 principle as the liquid crystal display is a liquid crystal display using a liquid crystal physical properties, controlled by the voltage on its display area, there is an electric display, i.e., so that the graphic can be displayed.
lcd1602 instruction list:
Lcd1602 inside the liquid crystal module controller has control instruction 11, the following table
lcd1602 Instructions:
Lcd1602 liquid crystal module write operation, and a cursor operation screen are achieved by programming instructions. (Note: 1 is high, 0 low)
Instruction 1: clear display instruction code 01H, 00H cursor is reset to the address position.
Instruction 2: reset the cursor, the cursor returns to the address 00H.
Instruction 3: cursor display mode is set and I / D: cursor movement direction, high right, left low S: whether all the text on the screen left or right. High indicates active low is invalid.
Instruction 4: display switch control. D: on and off controls the entire display, display high that open, low level indicates a display off C: control the cursor on and off, the high level represents the cursor, the cursor is no low level indicates B: Control whether the cursor flashing, blinking high, flicker is not low.
Instruction 5: cursor or display shift S / C: Mobile Display Text high level, low level to move the cursor.
Instruction 6: Function Set command DL: 4-bit bus at a high level, a low level when 8-bit bus N: is a low-line display, two-line display a high level F: Low 5x7 dot matrix character display, and the high level of 5x10 character dot matrix display.
Instruction 7: address setting character generator RAM.
Instruction 8: DDRAM address setting.
Instruction 9: busy signal and the read address of the cursor BF: as the busy bit, indicates the high level busy, the module does not receive a command or data, is represented as a low level if not busy.
Directive 10: Write data.
Instruction 11: read data.
lcd1602RAM address mapping and standard font table:
The liquid crystal display module is a slow display device, so before each instruction execution module must confirm the busy flag is low, it indicates busy, otherwise the instruction fails. To display the first character input display address character, which tells the module where the characters shown in the following figure is displayed inside lcd1602 address.
Such as the address of the first character of the second line is 40H, 40H so if you can write directly to position the cursor at the location of the second line of the first character of it? This does not work, since the highest bit D7 when the address constant is high writing display data is actually written to a so should be 01000000B (40H) + 10000000B (80H) = 11000000B (C0H).
In the initialization of the liquid crystal module is provided in which first display mode, the cursor is automatically shifted to the right when the liquid crystal module character display, without human intervention. Before each input command is determined to be a liquid crystal module is in a busy state. Lcd1602 inside the LCD module character generator memory (the CGROM) has stored 160 different character dot pattern, as shown above, these characters are: Arabic numerals, the English letter case, commonly used symbols, Japanese kana, and the like, each character has a fixed code, such as capital letter "a" code is 01000001B (41H), the dot-matrix display modules address 41H of the character graphics displays, we can see the letters "a" NS. , Reading the full text, the technology area
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