GDM128128A Datasheet, PDF (9/14 Pages) List of Unclassifed Manufacturers – SPECIFICATIONS OF LCD MODULE

GDM128128A
position.
The relationship between external display RAM address and display position
GH
GH +CL
GH+GA
GH + GA +CL
(GH+ GA)+ GA
GH +2 GA +CL
(GH +2 GA)+ GA
GH +3 GA +CL
/
/
GH +(N-1) GA
GH +(N-1) GA +CL
GH: Graphic home address
GA: Graphic area number (columns)
CL: columns ate fixed by hardware (pin-programmable)
Set text area
The display columns are defined by the hardware setting. This command can be used to
adjust the columns of the display.
Set graphic area
The display columns are defined by the hardware setting. This command can be used to
adjust the columns of the graphic display.
If the graphic area setting is set to match the desired number of columns on the LCD, the
addressing scheme will be automatically modified so that the start address of each line equals
the end address of the previous line +1.
3). Mode set
CODE
1000X000
1000X001
1000X011
1000X100
10000XXX
10001XXX
FUNCTION
OR Mode
EXOR Mode
AND Mode
TEXT Attribute Mode
Internal character Mode
External character Mode
OPERAND
—
—
—
—
—
—
The display mode is defined by this command. The display mode does not change until the
next command is sent. The logical OR, EXOR, AND of text or graphic display can be displayed.
In internal character generator mode, character codes 00H to 7FH are assigned to the built-in
character generator ROM. The character codes 80H to FFH are automatically assigned to the
external character generator RAM.
NOTE: attribute functions can only be applied to text display, since the attribute data is placed
in the graphic RAM area.
Attribute function
The attribute operations are reverse display, character blink and inhibit. The attribute data is
written into the graphic area, which was defined by the set control word command. Only text
display is possible in attribute function mode; graphic display is automatically disabled. However,
the display mode command must be used to turn both text and graphic on in order for the
attribute function to be available.
The attribute data for each character in the text area is written to the same address in the
graphic area. The attribute function is defined as follows.
Attribute RAM 1byte
X
X
X
X DB3 DB2 DB1 DB0
V: A
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2001/12/05