深圳市烨新达实业有限公司
YXD-12864B LCM 技术资料
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深圳市烨新达实业有限公司
YXD-12864B LCM 技术资料
Summary
LCM YXD-12864B is a graphics dot matrix liquid crystal display module, which is
composed of a line driver, a column driver and a 128 * 64 full lattice liquid crystal
display, which can display the Chinese characters of 4 * 8 (16 * 16).
Main technical parameters and performance:
1, power supply (VDD):+5V
2, display content: 128 (column) x 64 (line)
3, the whole screen lattice
4. Seven kinds of instructions.
5, the 8 bit data bus is used in parallel with the CPU interface to input the output
and 8 control lines.
6, duty cycle (DUTY): 1/64
7, working temperature: -20, +70, storage temperature: -30 ~ +85
8, the working current of the module is about 3.4mA (5V), and the working current
is about 520mA (5V).
一、 Dimensions
1.Dimensions
图
2.Outline dimension
ITEM
Module volume
Visual field
Row array number
Point distance
Point size
1
NOMINSL DIMEN
93×70×9.5(LED 14.2)
66.52×33.24
128×64
0.52×0.52
0.48×0.48
表1
UNIT
MM
MM
DOTS
MM
MM
三．Module main hardware
1.Structure block diagram
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8
DB0-DB7
RS,R/W,E
CS1
CS2
/RST
VSS
VDD
V0
Vout
A
K
5
COMMON
DRIVER
YXD-12864B LCM 技术资料
3
SEGMENT
DRIVER
SEGMENT
DRIVER
LCD PANEL 128 X 64 DOTS
LED (EL) LIGHT
图2
2. Structure diagram
IC3 is a line driver.IC1, IC2 is a column driver.IC1, IC2, IC3 contains the following main
functions of the device.
1. The instruction register (IR)
IR is used to register the instruction code, and the data register storage data corresponding.
When D/I=0 in the E signal down along the role of the instruction code written in IR.
2. Data register (DR)
DR is used to store data, and the instruction register storage instructions corresponding.
When D/I=1, the falling edge of the E signal, the graphics display data write DR, or in the
high level of E signal data transfer between DB7-DB0 and.DR by the DR data bus and DDRAM is
automatically executed.
3. Busy logo: BF
The BF flag provides internal working conditions for the.BF=1 to express the module in the
internal operation, the module does not accept external instructions and data.BF=0, the module
is ready, ready to accept external instructions and data.
Using the READ STATUS command, you can read the DB7 bus to the BF bus, and then test the working
status of the module.
4. Display control trigger DFF
This trigger is used to control the.DFF=1 (ON DISPLAY), which is used to display the DDRAM
in the module screen. The content of the DFF=0 is displayed on the screen, and the is displayed
on the display (OFF DISPLAY).
The state of the DFF is controlled by ON/OFF DISPLAY and RET signals.
5. XY address counter.
The XY address counter is a 9 bit counter. The third is the X address counter, the low 6
bits are Y address counter, the XY address counter is actually the address pointer to X, the
DDRAM address counter is DDRAM's page pointer, the Y address counter is the Y DDRAM ground check.
X address counter is not counting function, can only use the instruction set.
Y address counter has the function of the cycle count, each display data is written, Y address
automatically add 1, Y address pointer from 0 to 63
6. Display data RAM (DDRAM)
DDRAM is the storage of graphics display data. The data for the 1 indicates the choice,
the data for the 0 to show the relationship between the.DDRAM and address and display location
of the DDRAM address table (see page sixth).
7. Z address counter
Z address counter is a 6 bit counter, this counter has a cycle count function, which is
used to display line scan synchronization. When a line scan is completed, the address counter
is automatically added 1, pointing to the next line scan data, RET reset Z address counter is
0
The Z address counter can be preset with the START LINE DISPLAY, so the starting line of
the display screen is controlled by the DDRAM data from which row is displayed on the first
line of the screen. The DDRAM of this module can be displayed in a total of 64 lines, so the
screen can be displayed on the 64 row.
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四. 模块的外部接口
Pin
Name
number
1
VSS
2
VDD
LEVE
0V
5.0V
-5.0V~(-1
3V)
3
V0
4
D/I
H/L
5
R/W
H/L
6
E
H
7
|
14
15
DB0
|
DB7
CS1
16
CS2
H
17
18
19
20
/RST
VOUT
A
K
H,H-L
-9.0V
5.0V
0V
YXD-12864B LCM 技术资料
Pin function description
Power source
Power supply voltage
Driving voltage of liquid crystal display
D/I= "H" indicates that DB7-DB0 is the display data
D/I= "L" indicates the DB7-DB0 to display the
instruction data
"R/W= H E=", "H" data read DB7-DB0
R/W= "L", E= "H" "L", DB7-DB0 data to IR or DR
Enable signal:
R/W= "L", the E signal decreases along the latch
DB7-DB0
R/W= "H", E= "H", DDRAM data read to DB7-DB0
H/L
Data bus
H
Select IC1, that is, before (left) 64 columns
Select IC2, that is, after the selection (right) 64
column
Reset control signal, RST=0
Internal negative pressure generator output voltage
LED backlight power +
LED backlight power 表 2
五.
Instruction description
IL
Instruction code
Instructi
on
RW DI D7 D6 D5 D4 D3
Display
ON/OFF
Display
Starting
line
Set up
X
address
Set up
Y
address
0
0
0
0
0
0
1
1
0
0
1
0
0
0
0
1
1
1
1
D2
D1
D0
1
1
1/0
1
1
Control switch
Does not affect the data and the
internal state of the DDRAM
Specify which line to start from
the DDRAM
显示起始行（0-63）
1
function
Set DDRAM address (X
address)
X:0-7
Y 地址（0-63）
Set column address (Y address)
Read state
Reading
status
Write
display
data
Read
and
display
1
0
B
U
S
Y
0
ON
/
OFF
R
S
T
RST: 1, reset; 0: normal
0
0
0
0
ON/OFF:0: display: 1: show off
0
1
View data
BUSY: 1 internal operation; 0:
ready
Writing data online DDRAM
DB0-DB7
1
1
View data
Writing data online DDRAM
DB0-DB7
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深圳市烨新达实业有限公司
YXD-12864B LCM 技术资料
data
表
3
Display switch control (DISPLAY ON/OFF)
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
0
0
0
1
1
1
1
1
D
D=1: (DISPLAY ON) that display display can display operation
D=0: Guan Xianshi (DISPLAY OFF) were all on display that can display operation
2. DISPLAY START LINE
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
0
1
1
A5
A4
A3
A2
A1
A0
In front of the Z address counter a section has described the show that the starting line is
controlled by the Z address counter.A5-A0 6 bit address automatically sent to the Z address
counter, the address of the starting line can be an arbitrary line of 0-63.
For example, the selection of A5-A0 is 62, then the corresponding relationship between the
starting line and the DDRAM line is as follows:
DDRAM line: 62 63 0 1 2 3. . . . . . . . . . . . . . . . . . . . . . . . . 28 29
Screen display line: 1 2 3 4 5 6 7 . . . . . . . . . . . . . . . . . . . . . . . 63 64
3.Set page address ( SET PAGE “X ADDRESS” )
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
0
1
0
1
1
1
A2
A1
A0
1.
DDRAM the so-called page address is the address and eight pages, module, a total of 64 row 8 pages,
A2-A0 said 0-7 page. Read and write data has no effect on the page address, page address by the
instruction or the rst signal change reset address overleaf.
The corresponding relationship between the page address and DDRAM see the DDRAM address table.
4.( SET Y ADDRESS )
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
0
0
1
A5
A4
A3
A2
A1
A0
The function of this instruction is to send A5-A0 into the Y address counter, as the Y DDRAM address
pointer.
After reading and writing to the Y, the DDRAM address pointer automatically adds 1 to the next
DDRAM unit.
DDRAM address table:
CS1=1
Y=
0
1
2
X=
DB0
0
↓
DB7
X=
DB0
1↓
6
DB7
X=
DB0
7
↓
DB7
3
…
DB0
↓
DB7
DB0
↓
DB7
DB0
↓
DB7
表
62
63
CS2=1
0
1
2
DB0
↓
↓DB7
DB0
↓
DB0
↓
DB7
3
...
DB0
62
行号
0
DB7
7
8
DB0
↓DB7
DB7
DB0
↓ DB7
63
55
56
DB7
63
4
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5.读状态
（STATUS READ）
R/W
D/I
1
0
DB7
BF
DB6
0
DB5
ON/OFF
DB4
RST
YXD-12864B LCM 技术资料
DB3
0
DB2
0
DB1
0
DB0
0
When R/W=1, D/I=0, the E signal to the "H" role, the status of the data bus, (DB7-DB0), respectively,
the corresponding position.
BF: has been described in the previous half (see the BF flag bit).
ON/OFF: Indicates the state of the DFF trigger (see DFF trigger section).
RST: RST=1 says the internal is being initialized, and the component does not accept any
instructions or data.
6.写显示数据 （WRITE DISPLAY DATE）
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
0
1
D7
D6
D5
D4
D3
D2
D1
D0
D7-D0 to display data, this instruction is written to the corresponding DDRAM D7-D0 unit, Y
address pointer automatically add 17.读显示数据处理（READ DISPLAY DATA）
R/W
D/I
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
1
1
D7
D6
D5
D4
D3
D2
D1
D0
This instruction reads the contents of D7-D0 to DB7-DB0, and the Y address instruction
automatically adds 1
六、
Read and write operation sequence
1．
Write operation sequence
图
3
2. Read operation sequence
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图
2. Read and write timing parameter list
Name
Sign number Min
E cycle time
Tcyc
1000
E High level width
Pweh
450
E Low level width
Pwel
450
E rise time
Tr
---E Fall time
Tf
---Address setup time
Tas
140
Address hold time
Tah
10
Data set up time
Tdsw
200
Data delay time
Tddr
---Write data hold time
Tdhw
10
Read data retention timeTdhw
20
表
六.
YXD-12864B LCM 技术资料
4
Typical value Max
--------------25
--25
--------------320
---------
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
Application examples
12864 与单片机 8751 的一种简单接口如图 5 所示
图
5
利用图 5 举例介绍几个编程举例.
OUTI1: SETB
P3.4
SETB P3.3
CLR
P3.1
CLR
P3.0
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深圳市烨新达实业有限公司
YXD-12864B LCM 技术资料
MOV P1,A
CLR P3.3
CLR P3.4
RET
OUTI2:
RET
OUTD1:
RET
OUTD2:
SETB
SETB
CLR
CLR
MOV
CLR
CLR
P3.5
P3.3
P3.1
P3.0
P1,A
P3.3
P3.5
SETB P3.4
SETB P3.3
SETB P3.1
CLR
P3.0
MOV P1,A
CLR
P3.3
CLR P3.4
SETB P3.5
SETB P3.3
SETB P3.1
CLR P3.0
MOV P1,A
CLR P3.3
CLR P3.5
RET
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