Microadapt 1602A Manual de usuario
1602 A instructions
1602 A instructions
LCD USER manual
Directory
Summarize
Shape dimension
Module mainly hardware description
The external interface module
Command instructions
Ceading and writing operation sequence
Software initialization
Summarize
（1602A QAPASS ）is an industrial character type LCD, can also shows that 16 x02 namely 32
characters. (16 column 2 line)
Second:module size (pictured)
Three:pin interface specifications table
Numbers symbols pin pin that Numbers symbols that
Numbers
symbols Pin that Numbers symbols Pin that
1 VSS To power 9 D2 data
2 VDD power positive 10 D3 data
3 VL Liquid crystal display bias 11 D4 data
4 RS Data/command options 12 D5 data
5 R/W Read/write choice 13 D6 data
6 E By using the signal 14 D7 data
7 D0 data 15 BLA Backlighting power
positive
8 D1 data 16 BLK Backlighting power
negative
1 foot: for to power VSS.
2 feet: VDD take 5 V is power.
3 feet: VL for LCD contrast the adjustment, and then when the power is the weakest contrast,
grounded contrast the highest, and the contrast
Through high can produce the "ghost", when used, can pass a 10 K adjust
potentiometer contrast.
4 feet: RS for registers choice, high electric usually choose data registers, low electric usually
choose instruction register.
5 feet: R/W signal lines for reading and writing, high electric usually are read operation, low
electricity at ordinary times for write operation. When the RS and the R/W common
For low electricity can be written instructions at ordinary times, or displays address, when RS for
low level R/W high power for at ordinary times can read busy signal, and when
RS for high level R/W for low electricity data can be written at ordinary times.
6 feet: E end to make can end, when E is driven by high level jump into low electricity at
ordinary times, LCD module executive order.
7 to 14 feet: D0 ~ D7 for eight two-way data cables.
15 feet: back light positive.
16 feet: back light negative.
4.
1602 LCD instructions in time sequence that
1602 LCD module internal controller of article 11 control instruction, as the chart shows:
Numb
ers
instructions
RS
R/W
D7
D6
D5
D4
D3
D2
D1
D0
1 Clear display 0
0 0
0 0 0 0 0 0 1
2 Cursor to return to 0
0 0
0 0 0 0 0 1 *
3 Buy input mode 0
0 0
0 0 0 0 1 I/D
S
4 Display the on/off
control 0
0 0
0 0 0 1 D C B
5 The cursor or character
shift 0
0 0
0 0 1 S/C
R/L
* *
6 Buy function 0
0 0
0 1 DL N F * *
7
Buy character CunZhuQi
address happens
0
0
0
1
Characters CunZhuQi address happens
8 Buy data CunZhuQi 0
0 1
Display the data CunZhuQi address
9 Read busy symbols or
address 0
1 BF
Counter address
10 Write count to CFRAM or
DDRAM 1
0 To write data content
11 From CFRAM or DDRAM
readings 1
1 Read data content
4: 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 eachinstruction
before must affirm module mark is busy low electricity
Flat, said were not busy, otherwise this instruction failure. To display character
before 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
Este manual sirve para los siguientes modelos
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