TOPWAY

LCD Module User Manual

LM3033CDW-0B

www.topwaysz.com

Document Name: LM3033CDW-0B-Manual-Rev0.1.DOC

Page: 9 of 13

4.4

Display Memory Map

There are three main memory-areas in the LCD module for display.

-

Character Generator RAM (CGRAM)

-

Graphic Display RAM (GDRAM)

-

Display Data RAM (DDRAM)

4.4.1 Character Generator RAM (CGRAM)

Character Generator RAM is for storing the User-defined Characters (a 16x16 dots font). There are

only four characters could be defined. The User-defined Character Codes are 0000h and 0002h.

They could be called into DDRAM as normal character.

CGRAM data

User-defined

Character Code

CGRAM

Address

D15

~

D8

D7

~

D0

0000h

00h

:

0Fh

0002h

10h

:

1Fh

0004h

20h

:

2Fh

0006h

30h

:

3Fh

CGRAM Address Map

4.4.2 Graphics Display RAM (GDRAM)

GDRAM is for full graphics display. It could be displayed when G=1 (set by EXTENDED

FUNCTION SET in Extended Instruction Set)

Horizontal Address (X)

00h

01h

~

06h

07h

D15 ~ D0

D15 ~ D0

~

D15 ~ D0

D15 ~ D0

00h

01h

:

:

:

1Eh

1Fh

00h

01h

:

:

:

1Eh

1Fh

D15 ~ D0

D15 ~ D0

~

D15 ~ D0

D15 ~ D0

08h

09h

~

0Eh

0Fh

Horizontal Address (X)

GDRAM Address Map

Note:

*1. The mapping is based on Vertical Scroll Displacement Address=0.

*2. Another 128x64 Graphics Display RAM space is not showed. They could be displayed by adjusting the Vertical Scroll

Displacement Address value.

128x64 pixels

16 x 16 dot font

16 x 16 dot font

16 x 16 dot font

16 x 16 dot font