LM12864LFW

LM12864LFW

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

K.C.

Date: 2008-07-01

Date:

Rev. Descriptions

Release Date

0.1

Preliminary New release

2008-07-01

URL: www.topwaydisplay.com

Document Name: LM12864LFW-Manual-Rev0.1

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TOPWAY

LCD Module User Manual

LM12864LFW

Table of Content

1. Basic Specifications .............................................................................................................. 3

1.1

Display Specifications ............................................................................................................................................ 3

1.2

Mechanical Specifications ...................................................................................................................................... 3

1.3

Block Diagram ........................................................................................................................................................ 3

1.4

Terminal Functions ................................................................................................................................................. 4

2. Absolute Maximum Ratings .................................................................................................. 5

3. Electrical Characteristics ...................................................................................................... 5

3.1

DC Characteristics ................................................................................................................................................. 5

3.2

LED Backlight Circuit Characteristics ..................................................................................................................... 5

3.3

AC Characteristics ................................................................................................................................................. 6

4. Function Specifications ......................................................................................................... 7

4.1

Basic Setting .......................................................................................................................................................... 7

4.2

Adjusting the LCD display contrast ........................................................................................................................ 7

4.3

Resetting the LCD module ..................................................................................................................................... 7

4.4

Display Memory Map ............................................................................................................................................. 8

4.5

Internal Registers ................................................................................................................................................... 8

4.6

Display Control Instructions ................................................................................................................................... 9

5. Design and Handling Precaution ........................................................................................ 10

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Document Name: LM12864LFW-Manual-Rev0.1

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LCD Module User Manual

LM12864LFW

1. Basic Specifications

1.1 Display Specifications

1) LCD Display Mode

: STN, Negative, Transmissive

2) Display Color

: Display Data = “1” : Light Gray (*1)

: Display Data = “0” : Deep Blue (*2)

3) Viewing Angle

: 6 H

4) Driving Method

: 1/64 duty, 1/ 9bias

5) Back Light

: White LED backlight

Note:

*1. Color tone may slightly change by Temperature and Driving Condition.

*2. The Color is defined as the inactive / background color

1.2 Mechanical Specifications

1) Outline Dimension

: 93.0 x 70.0 x 13.8MAX

(see attached Outline Drawing for details)

1.3 Block Diagram

BLA, BLK

LED Backlight Circuit

LCD Panel

128 x 64 pixels

VDD, VSS

Power

S6B0108

VOUT, V0

Booster

Circuit

equivalent

DB0 - DB7

RS, R/W, E, /RST

CS1

CS2

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LM12864LFW

1.4 Terminal Functions

No. Name

I/O

Descriptions

VSS Power Negative Power Supply, Ground (0V)

VDD Power Positive Power Supply

Power LCD Contrast reference

Input RS = H; DB0 – DB7 = Display RAM data

RS = L; DB0 – DB7 = Instruction data

R/W

Input In read mode

Input

R/W = H;

Data read form the LCD module,

data appears at DB0 – DB7 and can be read by the host

while, E = H and the device is being selected

In write mode

R/W = L;

Data write to the LCD module,

data appears at DB0 – DB7 will be written into the LCD module

at E = H  L and device is being selected

DB0

I/O

Data bus;

Three state I/O terminal for display data or instruction data

DB7

I/O

CS1

Input Chip selection,

When CS1=1 (*1)

enable access to the Left Side (64 column) of the LCD module

CS2

Input Chip selection

When CS2=1 (*1)

enable access to the Right Side (64 column) of the LCD module

/RST

Input Reset signal

/RST = L,

Display off

display start line register becomes 0

no command or instruction data could be accepted

/RST = H,

Normal running

18 VOUT Output Power Booster output for V0

BLA Power Positive Power for LED backlight

BLK Power Negative Power for LED backlight

Note:

*1.

Display or instruction data could write into the LCD module’s driver/controllers individually

or at the same time.

Only read display or instruction data form one of the driver/controller in the LCD module at

a time, otherwise unexpected data collision may occur.

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LM12864LFW

2. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit

Condition

Supply Voltage

V DD

7.0

V SS = 0V

Operating Temperature

T OP

-20

 C

No Condensation

Storage Temperature

T ST

-30

 C

No Condensation

Cautions:

Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the

device. Functional operation of this device at other conditions beyond those listed in the

specification is not implied and prolonged exposure to extreme conditions may affect device

reliability.

3. Electrical Characteristics

3.1 DC Characteristics

V SS =0V, V DD =5V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Operating Voltage

V DD

4.8

5.0

5.2

VDD

Input High Voltage

V IH

3.5

V DD

RS, R/W, E, CS1, CS2,

Input Low Voltage

V IL

0.4

DB0-DB7

Operating Current

I DD

6.5

VDD, VSS

3.2 LED Backlight Circuit Characteristics

V BLK =0V, If BLA =80mA, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit Applicable Pin

Forward Voltage

Vf BLA

4.9

BLA, BLK

Forward Current

If BLA

120

mA BLA, BLK

BLA

BLK

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LCD Module User Manual

LM12864LFW

3.3 AC Characteristics

V SS =0V, V DD =5V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

E cycle time

1500

E high level width

twh

700

E low level width

twl

700

E rise time

E fall time

Address set-up time

tasu

210

Address hold time

tah

Data set-up time

tdsu

300

Data delay time

480

Data hold time (write)

tdhw

Data hold time (read)

tdhr

Host Write Timing Diagram

Host Read Timing Diagram

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LCD Module User Manual

LM12864LFW

4. Function Specifications

4.1 Basic Setting

To drive the LCD module correctly and provide normally display, please use the following setting

Display start line (Z address)= 0

LCD Display = on

Note:

These setting/commands should issue to both controllers while start up.

See the Display Control Instructions section for details.

LCD module

4.2 Adjusting the LCD display contrast

VDD

A Variable-Resistor must be connected to the

LCD module for providing a reference to V0.

Adjusting the VR will result the change of LCD

display contrast.

The recommended value of VR is 25k to 50k

VOUT

VSS

4.3 Resetting the LCD module

The LCD module should be initialized by setting /RST terminal at low level when turning the power

on.

When /RST pull low, the LCD module will:

- Display off

- Display start line register becomes 0. (Z-address=0)

While /RST is low, no instruction can be accepted except status read. Therefore, execute other

instructions after making sure that DB4=0 (clear /RST) and DB7=0 (ready) by status read

instruction. The conditions of power supply at initial power up are as follow:

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

trs

2.0

Rise time

150

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LCD Module User Manual

LM12864LFW

4.4 Display Memory Map

Page (X)

address

data

LCD Display (front view)

128x64 pixels

Column(Y) Address

00h  3Fh

Chip Select

CS1=1, CS2=0

CS1=0, CS2=1

Note:

1) Display star line (Z address) = 0

2) The Display Data store separately in two drivers.

3) The Display Data for the left section could be accessed by CS1=1.

The Display Data for the right section could be accessed by CS2=1.

4.5 Internal Registers

There are three registers in each section of LCD module. Each of them could be controlled

independently.

Page (X) Address Register

X address register designates pages of the internal display data RAM. Count function is not

available. The address should set by instruction.

Column (Y) Address Counter

Y address counter designates address of the internal display data RAM. It could be set by

instruction and is increased by 1 automatically by read or write display data operations.

Display Start Line (Z) Register

Z address register indicates of display data RAM to LCD top line. It may be used for scrolling the

display pattern on the LCD.

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LCD Module User Manual

LM12864LFW

4.6 Display Control Instructions

Code

Instructions

Function

Note

Controls the display on or off. Internal status and

Display on/off

0 0 0 0 1 1 1 1 1 1/0 display data in RAM is not affected

0=off, 1=on

Set Column (Y)

0 0 0 1

Y address (0-63)

Set the Column address into the Y address

Address

counter

Set Page (X)

X address

0 0 1 0 1 1 1

Address

(0-7)

Set the Page address into the X address register *2

Set Display Start

Z address

0 0 1 1

Indicates the display data RAM displayed at the

Line (Z address)

(0-63)

top of the screen

Read status

Busy=L, Driver ready; Busy=H, Driver busy

Status Read

0 1

0 0 0 0

on/off=L, Display is on; on/off=H, Display is off

Reset=L, Normal Running; Reset=H, reset

Write display data into display data RAM,

Write Display Data 1 0

Write data

After writing instruction, Y address counter

increased by 1 automatically

Read Display Data 1 1

Read data

Read display data form the display data RAM

Note:

*1. Only one section (driver) could be read at the same time.

i.e. only the following setting is valid for the operation:

CS1=1, CS2=0

is valid

CS1=0, CS2=1

is valid

*2. Instruction could be write into both drivers at the same time.

*3. For the details of the Display Control Instructions, please refer to Samsung S6B0108

handbook.

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LCD Module User Manual

LM12864LFW

5. Design and Handling Precaution

Please refer to "LCD-Module-Design-Handling-Precaution.pdf".

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Document Name: LM12864LFW-Manual-Rev0.1

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