TOPWAY

LCD Module User Manual

LM3121

www.topwaysz.com

Document Name: LM3121-Manual-Rev0.2

Page: 8 of 9

4.4

Display Data RAM Memory Map

Page Address

data

LCD Display (front view)

0

D0

:

D7

1

D0

:

D7

2

D0

:

D7

3

D0

:

D7

Column Address

00h

3Ch

00h

4Fh

00h

3Ch

Driver (accessed by)

E1

E2

E3

Note:

*1. Display Start Line = 0

*2. ADC = 0

*3. The Display Data for the left section could be accessed by E1.

The Display Data for the middle section could be accessed by E2.

The Display Data for the right section could be accessed by E3.

4.5

Display Command

Code

Instructions

Function

Note

Display ON/OFF

0

0

1

0

1

0

1

1

1 0/1

0 = OFF

1 = ON

(Display Data RAM is not affected)

*1

Set

Display Start Line

0

0

1

1

0

Display Start Line

(0 ~31)

Specifies RAM line corresponding

to the top line of display

*1

Set

Page Address

0

0

1

0

1

1

1

0

Page

(0 ~ 3)

Set Page Address Register

*1

Set

Column Address

0

0

0

Column Address

(0 ~ 79)

Set Column Address Counter

*1

Read Status

1

0

0

0

0

0

Busy=1, Busy

Busy=0, Ready

ADC=1, CW output

ADC=0, CCW output

ON/OFF=1, Display off

ON/OFF=0, Display on

Reset=1, Being reset

Reset=0, Normal

*3

Write

Display Data

0

1

Display Data

Write Display Data to display data RAM

*1

Read

Display Data

1

1

Display Data

Read Display Data from display data RAM

*3

Select ADC

0

0

1

0

1

0

0

0

0 0/1 0 = CW output

1 = CCW output

*1

Static Drive

ON/OFF

0

0

1

0

1

0

0

1

0 0/1 0 = normal drive

1 = static drive

*1

Select duty

0

0

1

0

1

0

1

0

0 0/1 0 = 1/16 duty

1 = 1/32 duty

*1

Read-Modify-Write

0

0

1

1

1

0

0

0

0

0

Read-modify-write = ON

*1

End

0

0

1

1

1

0

1

1

1

0

Read-modify-write = OFF

*1

Reset

0

0

1

1

1

0

0

0

1

0

Software Reset

*1

Note:

*1. For the details of the Display Command, please refer to AX6120 datasheet.

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

*3. Only read display data or status form one of the driver/controller in the LCD module at a time,

otherwise unexpected data collision will occur.

202x32 pixels