LM12864BCW

LM12864BCW

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Luo Lin

Date: 2017-07-25

Date:

Rev. Descriptions

Release Date

0.1

Preliminary release

2017-07-25

URL: www.topwaydisplay.com

Document Name:LM12864BCW-Manual-Rev0.1

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LCD Module User Manual

LM12864BCW

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

1.5 Backlight 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 Adjusting the Display Contrast ...................................................................................................................................... 7

4.2 Application circuit(Example) .......................................................................................................................................... 7

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

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

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

4.6 Display Commands ....................................................................................................................................................... 9

4.7 Display Commands (continue) .................................................................................................................................... 10

5. Design and Handling Precaution ............................................................................................. 11

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LCD Module User Manual

LM12864BCW

1. Basic Specifications

1.1 Display Specifications

1) LCD Display Mode

: FSTN,Positive, Transflective

2) Display Color

: Display Data = “1” : Dark Gray (*1)

: Display Data = “0” : Light Gray (*2)

3) Viewing Angle

: 6H

4) Driving Method

: 1/65 duty, 1/9 bias

5) Backlight

: 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

*3. Fine Contrast adjustment function is necessary in the application design for optimal display result

1.2 Mechanical Specifications

1) Outline Dimension

: 78.5 x 51.0 x 8.9 (mm) (exclude FPC)

(See attached Outline Drawing for details)

1.3 Block Diagram

BLA

BLK

Backlight Circuit

ST7565R or equivalent

VDD,VSS

VR,V0~V4,VRS,VOUT

LCD Panel

C3P,C1N,C1P,C2P,C2N,C4P

128 × 64Pixels

/WR,/RD,D0~D7

IRS,C86,P/S,/CS1, /RES, A0

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LM12864BCW

1.4 Terminal Functions

Descriptions

Pin No.

8-bit parallel

Serial

Name

I/O

80mode

8-bit parallel

68mode

4wire

Chip Select

/CS1

Input /CS1=L, enable access to the LCD module

/CS1=H, disable access to the LCD module

Reset signal

/RES

Input /RES = L, Initialization is executed

/RES = H, Normal running.

Input A0 = H, Transferring the Display Data

A0 = L, Transferring the Control Data

/WR=L  H, /RD=H; Read write control

/RD (E) and /WR

Data or Instruction

R/W=H:

(R/W) are fixed to

/WR

(R/W)

Input latch into the LCD

data or status read

either “H” or “L”.

module

R/W=L:

data or command write

/WR=H, /RD=L;

Enable trigger

/RD(E)

Input

Data or Status read

form the LCD

module

8-bit Data bus;

D0 to D5 must be

Three state I/O terminal for display data or

fixed to “H”.

D6(SCL)

I/O

instruction data

Serial clock input

D7(SI)

Serial data input

VDD

Power Poitive Power Supply

VSS

Power 0V Power Supply, Ground

VOUT

Power Power Booster Output for V0

C3P

Power Booster Circuit Capacitance terminals

C1N

C1P

C2P

C2N

C4P

VRS

Power

This is the internal-output VREG power supply for the LCD power supply

voltagere gulator.

Power LCD driving voltage supply terminals

Power

Input Power Booster Resistor ratio reference input

This is the MPU interface selection pin.

C86

Input C86 = “H”: 6800 Series MPU interface.

C86 = “L”: 8080 Series MPU interface.

This pin configures the interface to be parallel mode or serial mode.

P/S

Input P/S = “H”: Parallel data input/output.

P/S = “L”: Serial data input.

Select the resistors for the V0 voltage level adjustment

IRS

Input

IRS=H, Using the internal resistors

IRS=L, Not using the internal resistor, the V0 voltage level is regulated by

an external resistive voltage divider attached to the VR Terminal

1.5 Backlight Functions

PIN NO

PIN Name

I/O

Descriptions

BLA

Supply Backlight Positive power supply

BLK

Supply Backlight Negative power supply

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LCD Module User Manual

LM12864BCW

2. Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit Condition

Supply Voltage

V DD

-0.3

+3.6

V SS = 0V

Input Voltage

V IN

-0.3

V DD +0.3

V SS = 0V

Operating Temperature

T OP

-20

+70

 C

No Condensation

Storage Temperature

T ST

-30

+80

 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 =3.3V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit Condition /

Application Pin

Operating Voltage

V DD

2.7

3.3

VDD

Input High Voltage

V IH

0.8xV DD

V DD

/RES, /CS1, A0,

Input Low Voltage

V IL

V SS

0.2xV DD

/WR, /RD,D0~D7

Operating Current

I DD

0.36

2.0

mA VDD

3.2 LED Backlight Circuit Characteristics

BLK=0V, BLA=3.3V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Applicable Pin

Forward Voltage

BLA

3.3

BLA

Forward Current

I BLA

BLA

Cautions:

Exceeding the recommended driving current could cause substantial damage to the backlight and shorten its lifetime.

BLA

BLK

No. of LED = 4pcs

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3.3 AC Characteristics

3.3.1 8080 Mode System Bus Timing

V SS =0V, V DD =3.3V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

System cycle time

tcyc8

240

Address setup time (A0)

taw8

Address hold time (A0)

tah8

Control LOW pulse width (/WR)

tcclw

Control LOW pulse width (/RD)

tcclr

140

Control HIGH pulse width (/WR)

tcchw

Control HIGH pulse width (/RD)

tcchr

Data setup time

tds8

Data hold time

tdh8

/RD access time (*2)

tacc8

Output disable time (*2)

tch8

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. CL=100pF

*3.All timing is using 20% and 80% of VDD as the reference.

3.3.2 Reset Timing

V SS =0V, V DD =3.3V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset time

2.5

μs

Reset LOW pulse width

trw

2.5

μs

Note:

*1.All timing is using 20% and 80% of VDD as the reference.

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LCD Module User Manual

LM12864BCW

4. Function specifications

4.1 Adjusting the Display Contrast

- This LCD module equipped with latest digital contrast adjustment function.

- Its display contrast could be adjusted by MCU command. (please see the command tables for

details)

- It is recommended to provide a contrast adjustment interface for end-user, where the best

display result could meet the individual preference in mass production.

4.2 Application circuit(Example)

- 4x boosting

IRS

- 8-bit Parallel 8080 mode

P/S

VDD

VSS

- Using internal ref resistor

C86

- C1~C5=1.0μF (25V)

- C6~C9=1.0μF(25V)

VSS

VRS

C4P

C2N

C2P

C1P

C1N

C3P

VOUT

VSS

VDD

/RD

Note:

/WR

Please refer to the ST7565R data

/RES

sheet for details

/CS1

4.3 Basic Setting

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

- ADC = 1 (reverse)

- SHL select = 0 (normal)

- LCD Bias Select = 1/9

- Initial Display Line = 0

- Entire Display ON/OFF = OFF (normal)

- Reverse Display ON/OFF = OFF (normal)

- Set Power Control Set:

voltage follower = ON, voltage converter = ON, voltage regulator = ON

- Display ON/OFF = ON

Note:

*1. These setting/commands should issue the LCD module while start up.

*2. See the Display Commands section for details.

4.4 Resetting the LCD module

The LCD module should be initialized by using /RES terminal.

While turning on the VDD and VSS power supply, maintain /RES terminal at LOW level. After the

power supply stabilized, release the reset terminal (/RES=HIGH)

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LCD Module User Manual

LM12864BCW

4.5 Display Memory Map

Page address

data

LCD Display (front view)

128x64 pixels

Column Address

00h



7Fh

Note:

*1. ADC = 1 (reverse)

*2. SHL Selection = 0 (normal)

*3. Initial Display Line = 0

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4.6 Display Commands

Code

No. Instructions

Function

DON=0, display off

Display ON/OFF

0 1 0 1 0 1 0 1 1 1

DON=1, display on

Display start

Sets the display RAM display start line

Display start line set

0 1 0 0 1

address

Page

Set Page Address

0 1 0 1 0 1 1

Address

Set the display RAM page address

Set Column Address

0 1 0 0 0 0 1

Col. Add.

Set the upper-4-bit of column address counter

(Upper-4-bits)

Upper

Set Column Address

0 1 0 0 0 0 0

Col. Add.

Set the lower-4-bit of column address counter

(Lower-4-bits)

Lower

Read the status data

Read Status

0 0 1

Status

0 0 0 0

Write Display Data

1 1 0

Write Data

Write data into the display RAM

Read Display Data

1 0 1

Read Data

Read data form the display RAM

Sets the display RAM address SEG output

ADC Select

0 1 0 1 0 1 0 0 0 0

correspondence

ADC= 0,normal . ADC=1, reverse

REV=0, Normal display

Normal/Reverse Display 0 1 0 1 0 1 0 0 1 1

REV=1, Reverse display

EON=0, Normal display

Entire Display ON/OFF

0 1 0 1 0 1 0 0 1 0

EON=1, Entire display ON

Set the LCD driving voltage bias

Set LCD Bias

0 1 0 1 0 1 0 0 0 1

BIAS=0, 1/9 BIAS

BIAS=1, 1/7 BIAS

Enter the “Read-Modify-Write” mode

column address counter will increase in each

Set Read-Modify-Write

0 1 0 1 1 1 0 0 0 0 0 “Write Display Data”,

and will not increase in each “Read Display

Data command”

Reset Read-Modify-Write 0 1 0 1 1 1 0 1 1 1 0 Clear the “Read-Modify-Write” mode

Reset

0 1 0 1 1 1 0 0 0 1 0 Resets the LCD module

Set the COM scanning direction

SHL=0, Normal display

SHL Select

0 1 0 1 1 0 0

* * *

SHL=1, Flipped in y direction

* = don’t care terms

Set the power circuit operation mode

VF: LCD Supply Voltage Follower

Power Control Set

0 1 0 0 0 1 0 1

VR: LCD Supply Voltage Regulator

VC: LCD Supply Voltage Converter

(1=ON, 0=OFF)

Radio

Regulator Resistor Select 0 1 0 0 0 1 0 0

setting

Set the built-in resistor ratio (Rb/Ra)

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4.7 Display Commands (continue)

Code

No. Instructions

Function

Electronic volume mode set 0 1 0 1 0 0 0 0 0 0 1 Set reference voltage mode

Electronic volume register

Electronic

Set reference voltage register

set

0 1 0 * *

Control value (Display contrast value)

0 1 0 1 0 1 0 1 1 0 S Sleep Mode (2 byte command)

Sleep Mode Set

0 1 0 0 0 0 0 0 0 0 0

S=0, sleep mode

S=1, normal mode

Booster Ratio Set

0 1 0 1 1 1 1 1 0 0 0 Booster Ratio (2 byte command)

Ratio=00, 2x, 3x, 4x

0 1 0 0 0 0 0 0 0

Rati

Ratio=01, 5x

Ratio=11, 6x

NOP

0 1 0 1 1 1 0 0 0 1 1 Non-operation command

Note:

*1. Do not use any other command not listed, or the system malfunction may result.

*2. For the details of the Display Commands, please refer to ST7565R data sheet.

4.7.1 Power off the LCD Module

It recommends that enter Sleep Mode before power off the LCD module.

4.7.2 Refreshing The LCD Module

It recommends that the operating modes and display contents be refreshed periodically to prevent

the effect of unexpected noise.

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LCD Module User Manual

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5. Design and Handling Precaution

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

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