TOPWAY

TOPWAY

TOPWAY

TOPWAY

LCD Module User Manual

HM-0020

URL:

www.topwaydisplay.com

www.topwaysz.com

Document Name: HM-0020-Manual-Rev1.0.doc

Page: 8 of 12

4.2

Display Memory Map

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

-

Character Generator RAM (CGRAM)

-

Display Data RAM (DDRAM)

4.2.1

Character Generator RAM (CGRAM)

CGRAM is for storing the user-defined characters (5x8 dots font).

Totally 8 user-defined characters (character code = 00h ~ 07h) could be created.

The user-defined character codes are 00h and 07h. They could be called into DDRAM as normal

character.

CGRAM Data (Font Pattern)

User-Defined

Character Codes

CGRAM Data

sequence

D7 ~ D5

D4

~

D0

1

st

0

0

0

0

0

1

0

0

2

nd

0

0

0

0

0

0

0

0

3

rd

0

0

0

0

0

1

0

0

4

th

0

0

0

0

1

0

0

0

5

th

0

0

0

1

0

0

0

0

6

th

0

0

0

1

0

0

0

0

7

th

0

0

0

0

1

1

1

0

0x00

8

th

0

0

0

0

0

0

0

0

0x01

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x02

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x03

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x04

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x05

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x06

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

0x07

1

st

:

8

th

Not Use

5 x 8 dots

font pattern

Note:

*1. Module receives the character’s data sequence automatically;

*2. ‘¿’ is loaded where user-defined character code is 0x00, as showed above.