GDM240128A Datasheet, PDF (14/29 Pages) List of Unclassifed Manufacturers – LCD MODULE

User’s Manual
N3=1, select CGRAM and the character code is 00~FFH.
N3=0, select internal CGROM. Since the character code of CGROM is
00~7FH, when take 80H~FFH as character code, CGRAM is automatically
selected.
N2~N0: Combined-display mode setting. The functions are shown below:
N2
N1
0
0
0
0
0
1
1
0
N0 Means of Combination
0
“OR” mode
1
“EXOR”mode
1
“AND” mode
0
Text attribute mode
Only when the text mode and graphic mode are both on, the combined display
mode and text attribute mode settings are valid. After the text attribute setting,
the graphic area will be converted into text attribute area and store the text
attribute codes. The text attribute area is of the same size as text area. In
addition, the text attribute codes of the character codes in text area are stored
in the same address of graphic area. Every byte in the graphic area
determines the feature of its corresponding character, including the normal
display, reverse display, inhibit display, blink of normal display, blink of reverse
display and blink of reverse display of characters. In the text attribute area, the
text attribute codes of characters are made up with a byte’s low four bits.
D7 D6 D5 D4 D3 D2 D1 D0
*
*
*
*
d3
d2
d1
d0
d3: blink control. 1-blink, 0-no blink
d2~d0 :
d2
d1
d0
Function
0
0
0
Normal display
1
0
1
Reverse display
0
1
1
Inhibit display
To work in the text attribute mode, the user could build an independent area in
the DDRAM as text attribute area. In this case, the graphic home address
should be converted into the text attribute home address, and thus keep the
data in the previous graphic area. DDRAM could be divided as follows:
Graphic area
Text attribute area
Text area
CGRAM（2K）
5-6-4． Display mode setting, the format of command is as follows: no
parameter
1
0
0
1
N3 N2 N1 N0
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