Az LCD1602 karakteres LCD bemeneti és kimeneti bővítőkártya LCD kezelőpanelje
LCD Keypad Shield of the LCD1602 Character LCD Input and Output Expansion Board
Description
1. Module size: 20.5MM*41MM
2. Module weight: 54g
Introduction to 1602 Character LCD
Main technical parameters of 1602LCD:
1. Display capacity: 16×2 characters
2. Chip working voltage: 4.5—5.5V
3. Working current: 2.0mA (5.0V)
4. The suitable working voltage of the module: 5.0V
5. Character size: 2.95×4.35(W×H)mm
1 VSS power ground 9 D2 data

2 VDD power supply positive 10 D3 data
3 VL liquid crystal display bias 11 D4 data
4 RS data/command selection 12 D5 data
5 R/W read/write selection 13 D6 data
6 E enable signal 14 D7 data
7 D0 data 15 BLA backlight positive
8 D1 data 16 BLK backlight negative
Pin 1: VSS is the ground power supply.
Pin 2: VDD is connected to a 5V positive power supply.
The third pin: VL is the contrast adjustment terminal of the liquid crystal display, the contrast is weak when connected to the positive power supply, and the contrast when grounded
High, when the contrast is too high, it will produce "ghosting". When in use, you can adjust the contrast through a 10K potentiometer.
Pin 4: RS is the register selection, the data register is selected when the level is high, and the instruction register is selected when the level is low.
Pin 5: R/W is the read and write signal line, read operation at high level, and write operation at low level. When RS
It can write instruction or display address when it is low level together with R/W, when RS is low level and R/W is high level
The busy signal can be read, and data can be written when RS is high and R/W is low.
Pin 6: The E terminal is the enable terminal. When the E terminal changes from high level to low level, the LCD module executes the command.
Pins 7 to 14: D0 to D7 are 8-bit bidirectional data lines.
Pin 15: The positive electrode of the backlight.
The 16th foot: the negative pole of the backlight source.
1602LCD instruction description:
The controller inside the 1602 LCD module has a total of 11 control commands, as shown in the table below:
Serial number command RS R/W D7 D6 D5 D4 D3 D2 D1 D0
1 Clear screen 0 0 0 0 0 0 0 0 0 1
2 The cursor returns to 0 0 0 0 0 0 0 0 1 *

3-set input mode 0 0 0 0 0 0 0 1 I/D S
4 Display on/off control 0 0 0 0 0 0 1 D C B
5 Cursor or character shift 0 0 0 0 0 1 S/C R/L * *
6-set function 0 0 0 0 1 DL N F * *
7 Set character generation memory address 0 0 0 1 Character generation memory address
8 Set data memory address 0 0 1 Display data memory address
9 Read busy flag or address 0 1 BF counter address
10 Write the number to CGRAM or DDRAM) 1 0 The content of the data to be written
11 Reading from CGRAM or DDRAM 1 1 Data content read out
The 1602 liquid crystal module's read and write operations, screen and cursor operations are all realized through instruction programming. (Note: 1 is high level, 0 is low level)
Instruction 1: Clear display, instruction code 01H, and reset the cursor to address 00H.
Command 2: The cursor is reset, and the cursor returns to address 00H.
Instruction 3: Cursor and display mode setting I/D: Cursor moving direction, high level move right, low level move left S:
Whether all text on the screen moves to the left or right. High level means valid, low level is invalid.
Command 4: Display switch control. D: Control the on and off of the overall display, high level means open display, low power
Flat means off, display C: control the on and off of the cursor, high level means there is a cursor, low level means no cursor B: control
Control whether the cursor flashes, high level flashes, low level does not flash.
Instruction 5: Cursor or display shift S/C: Move the displayed text at high level, and move the cursor at low level.
Instruction 6: Function setting command DL: 4-bit bus at high level, 8-bit bus at low level N: low power
Usually single-line display, double-line display at high level F: display 5x7 dot matrix characters at low level, display at high level
5x10 dot matrix characters.
Command 7: Character generator RAM address setting.
Command 8: DDRAM address setting.
Instruction 9: Read busy signal and cursor address BF: busy flag bit, high level means busy, at this time the module cannot be connected
Receive commands or data, if it is low, it means it is not busy.
Command 10: Write data.
Command 11: Read data.
The chip timing table compatible with HD44780 is as follows:
Read status input RS=L, R/W=H, E=H output D0—D7=status word
Write command input RS=L, R/W=L, D0—D7=command code, E=high pulse output none

Read data input RS=H, R/W=H, E=H output D0—D7=data
Write data input RS=H, R/W=L, D0—D7=data, E=high pulse output
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