GDM240128A Datasheet, PDF (13/29 Pages) List of Unclassifed Manufacturers – LCD MODULE

User’s Manual
N1 N0
00
01
10
11
D1
Low adrs.
Columns
Low adrs.
Columns
D2
High adrs.
00H
High adrs.
00H
Code
40H
41H
42H
43H
Function
Set text home address
Set text area
(number of characters/line)
Set graphic home address
Set graphic area
(number of characters/line)
The text home address corresponds to the character position on the top left
corner of display panel. The graphic home address corresponds to the byte
position on the top left corner of display panel. The text area (number of
characters/line) set and graphic area (number of characters/line) set are used
to adjust the width (column) of valid display screen. The width indicates the
number of character or the number of bytes can be validly displayed.
Define the width of display screen to be CL by hardware and the width of
display screen to be TA by this command，then the relationship between text
area and its corresponding position on LCD panel is shown as follows:
（a）when TA<=CL:（TH stands for the text home address）
TH
……
TH+TA-1
TH+TA
……
TH+2TA-1
Blank
……
……
……
……
……
……
Å------------------ TA valid display screen ------------------ Æ
Å------------------------------------------- CL -----------------------------------------------Æ
（b）when TA>CL:
TH
……
TH+CL-1
……
TH+TA-1
TH+TA
……
TH+TA+CL-1 …… TH+2TA-1
……
……
……
do not transfer
……
……
……
Å------------------ CL valid display screen -------------------- Æ
Å------------------------------------------- TA -----------------------------------------------Æ
The way in which the graphic area corresponds to its position in display
screen is similar to the way in which the text area corresponds to its position in
display screen. The only difference is that in graphic area one byte
corresponds to 8 bits graphic data.
If the graphic area is defined to be the same number of characters/line of LCD,
the home address of every line equals to end address of the previous line +1.
5-6-3．Mode setting, the format of command is as follows: no parameter
1
0
0
0
N3 N2 N1 N0
N3: select character generator mode
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