ssd1908 Solomon Systech Limited:, ssd1908 Datasheet - Page 47

• Manufacturer Part Number: ssd1908
• Description: Lcd Drivers,lcd Controllers
• Manufacturer: Solomon Systech Limited:

7.2.5 Display Mode Registers
Bit 6
Bit 5
Bit 4
Reset
Type
state
SSD1908
Bit
Display Mode Register
Hardware Color Invert Enable
NA
7
0
0
Rev 1.0
Dithering
Disable
0
Dithering Disable
SSD1908 use a combination of FRC and 4 pixel square formation dithering to achieve
more colors per pixel.
When this bit = 0, dithering is enabled on the passive LCD panel. It allows maximum
64 intensity levels for each color component (RGB).
When this bit = 1, dithering is disabled on the passive LCD panel. It allows maximum
16 intensity levels for each color component (RGB).
Note
This bit does not refer to the number of simultaneously displayed colors but rather the
maximum available colors (refer Table 7-9 : LCD Bit-per-pixel Selection for the
maximum number of displayed colors).
Hardware Color Invert Enable
This bit allows the Color Invert feature to be controlled using the General Purpose IO
pin GPIO0. This option is not available if configured for a HR-TFT as GPIO0 is
used as an LCD control signal.
When this bit = 0, GPIO0 has no effect on the display color.
When this bit = 1, display color may be inverted via GPIO0.
Note
Display color is inverted after the Look-Up Table.
The SSD1908 requires some configurations before the hardware color invert feature
enabled.
•
•
•
If Hardware Color Invert is not available (i.e. HR-TFT panel is used), the color invert
function can be controlled by software using REG[70h] bit 4. Table 7-8 :
Mode Options
Software Color Invert
When this bit = 0, display color is normal.
When this bit = 1, display color is inverted.
See Table 7-8 : Color Invert Mode Options. This bit has no effect if REG[70h] bit 5 = 1.
Note
Display color is inverted after the Look-Up Table.
RW
6
0
P 37/37
CF3 must be set to 1 during RESET# is active
GPIO Pin Input Enable (REG[A9h] bit 7) must be set to 1
GPIO0 Pin IO Configuration (REG[A8h] bit 0) must be set to 0
Color Invert
Table 7-8 :
Hardware
Oct 2003
Enable
RW
5
0
summarizes the color invert options available.
Software Color Invert
Color Invert Mode Options
Color Invert
Software
RW
0
4
0
NA
0
0
3
GPIO0
X
Bit-per-pixel
Select Bit 2
RW
0
2
Display Color
Bit-per-pixel
Select Bit 1
Solomon Systech
Normal
RW
0
1
Color Invert
REG[70h]
Bit-per-pixel
Select Bit 0
RW
0
0