GU128X64-800B
8
9.2 Display On/Off (C/D= "1")
The GRAM Layer is selected with the 1st Byte of data. DDRAM (On/Off), GRAM (On/Off), DDRAM
(reverse or normal modes), GRAM (reverse or normal modes) and display merge are selected by
the 2nd Byte. Reverse mode toggles the representation of green in the foreground and black in the
background to the exact opposite - green to back and black to the foreground. This is similar to the
concept of reverse video.
1st Byte:
MSB LSB
0 0 1 0 L1 L0 * * * Either a “0” or a “1” is acceptable
< --------------------------- > < --------- >
Command Select Display Control Data
L1= (1 OR 0) = GRAM Layer 1 (Active OR Inactive)
L0= (
1 OR 0) = GRAM Layer 0 (Active OR Inactive)
2nd Byte:
MSB LSB
0 GS 0 GRV AND EXOR * * * Either a “0” or a “1” is acceptable
< --------------------------- ------------------- >
Display Control Data
GS= (1 OR 0) Graphic Display Area (GRAM) = (On OR Off)
GRV= (
1 OR 0) Graphic Display Area (GRAM) = (Reverse OR Normal)
DS=”0”, GS= “0”: Stand-by mode
1st Byte 2nd Byte
L1 L0 AND EXOR
Action
* * 1 * AND Display of Layer 1& 0
* * 0 1 EXOR Display of Layer 1& 0
1 1 0 0 OR Display of Layer 1& 0
1 0 0 0 Only Layer1 selected for display
0 1 0 0 Only Layer0 selected for display
0 0 0 0 Graphic Display Off
* Either a “0” or a “1” is acceptable
9.3 Brightness Set (C/D= "1")
The Brightness level of the display screen can be scaled by the following four bit control.
Please note that the brightness is consistent across the illuminated pixels. There is no scaling of
individual pixels. The display self-initializes to 100% brightness.
MSB LSB
0 1 0 0 BW3 BW2 BW1 BW0
< --------------------------- > < ---------------------------- >
Command Select Brightness Level Data
