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Part No: LCD1602A
Package / Case: LCD
Package / Case: LCD
Description:
1602 A instructions
1602 A instructions
LCD USES manual Directory
(1) Summarize
(2) shape dimension
(3) module mainly hardware description
(4) the external interface module
(5) command instructions
(6) reading and writing operation sequence
(7) software initialization
Summarize
HJ1602A is an industrial character type LCD, can also shows that 16 x02 namely
32 characters. (16 column 2 line)
Second:module size (pictured)
Three:
Three:pin interface specifications table
Numbers symbols pin pin that Numbers symbols that
14: control command table
1602 LCD module of reading and writing, and the screen and light mark operation
operations are through the instructions of programming realize. (note: 1 for high
Level, 0 for low level)
Instruction 1: clear display, instruction code 01 H, the cursor is reset to address
00 H position.
Instruction 2: the cursor reset, the cursor to return to address 00 H.
Instruction 3: the cursor and display mode I/D: cursor movement direction, high
level move to the right, low level moves left S: all on the screen
Is the text moves left or move to the right. High level said effective, low level
is invalid.
Instruction 4: display switch control. D: control overall display of open and shut,
high level says open display, low level said shut show
And C: the open and close to control a cursor, high level said the cursor, low
level said no cursor B: whether to control a cursor flashing,
High level flashing, low level do not twinkle.
Command 5: the cursor or display shift S/C: high electricity at ordinary times
of mobile displays text, low electric usually move the cursor.
Command 6: function setting command DL: high electricity at ordinary times for
four bus, low electricity at ordinary times for eight bus N: low electricity at
ordinary times for single line
Display, high electric usually pair on display F: low electricity at ordinary times
display 5 x7 of dot matrix characters, high electric usually display 5 x10 of dot
matrix characters.
Command 7: character generator RAM address Settings.
Instructions 8: DDRAM address Settings.
Instructions 9: read the busy signal and the cursor address BF: a sign for busy,
high level said busy, this time the module can't receive commands or
The data, if for low level is not busy said.
Directive 10: write data.
11 instructions: read data.
5. The basic operation sequence table
Graph: read operation sequence
Graph: write operation sequence
1602 LCD RAM address mapping and standard word stock list
Liquid crystal display module is a slow display device, so in the execution each
instruction before must affirm module mark is busy low electricity
Flat, said were not busy, otherwise this instruction failure. To display characterbefore display character input address, also is tell module in
Where display character.
6. 1602 internal display address (pictured)
For example the second line the first character address is 40 H, so whether written
40 H can directly to the cursor positioning in the second line
The first character position? So no, because that address to request when the top
bits D7 constant for high level 1 so
The actual writing data should be 01000000 B (40 H) + 10000000 B (80 H) = 11000000
B (C0H).
In the LCD module in the initialization of first set its display mode, in LCD module
display characters is automatic when the cursor move to the right,
Without human intervention. Every time before you judge input instructions LCD
module are in favor of the state.
1602 LCD module of the internal character happen storage
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