SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 133

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
SPC8106
01 LCD Support Register 0 RW
Force 8-dot
Mode
411-1.0
Slow Blink
Select
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Force 8-dot Mode
This bit is intended for use in TFT mode. When this bit = 1, 8-dot mode timing is forced and Hori-
zontal Panning bit 3 (ATC[13] bit 3) is forced to 0. Additionally in CRT mode (AUX[0B] bit 1 = 1) set-
ting this bit to 1 also forces the 25 MHz clock to be selected.
Slow Blink Select
This bit is used to select the blink rate of the cursor and text in text modes and graphics pixels in
graphics modes, if blink is enabled. If this bit = 0, the cursor, text or graphics pixels blink at their
normal rates. If this bit = 1, then everything blinks at half their respective normal rates. This option
may be used to make the blinking cursor more visible on some LCD panels. Note that in both nor-
mal and slow settings, the text mode cursor always blinks at twice the frequency of any blinking
characters.
Force Overscan Low
This bit is intended for use in TFT mode. When this bit = 1, pixel data output during overscan period
is forced to 0.
Green-only/NTSC GS Weighting Select
This bit is used to select one of two possible gray scale weighting functions to be applied to RGB
data as it is written to the internal 256x6 LCD gray scale lookup table or the internal sprite palette
registers. When this bit = 0, RGB data values are mapped to gray values using NTSC weighting.
When this bit = 1, the green component of the RGB data is used as the gray value. See “LCD Gray
Scale/Color Lookup Table Architecture” on page 122 for details. Note that this bit only has an effect
when monochrome LCD mode is selected (AUX[02] bit 6 = 0). If color LCD mode is selected
(AUX[02] bit 6 = 1), the gray scale weighting logic is bypassed.
Reverse/Normal Graphics
When the Reverse/Normal Graphics bit = 0, then normal display attributes are enabled. When this
bit = 1, then inverse video is displayed on the LCD display when in graphics modes (GRC[06] bit 0
= 1). This bit also affects the overscan color as set in bit 5 of this register. This bit has no effect on
the image displayed on the CRT display.
Reverse/Normal Text
When the Reverse/Normal Text bit = 0, then normal display attributes are enabled. When this bit =
1, then inverse video is displayed on the LCD display when in text modes (GRC[06] bit 0 = 0). This
bit also affects the overscan color as set in bit 5 of this register. This bit has no effect on the image
displayed on the CRT display.
Auto-Centering Enable
This bit is used to control the auto-centering function which allows display modes with less than
480 lines to be vertically centered on the LCD panel. If the Auto-Centering Enable bit = 0, then all
modes will be displayed with the first line at the top of the panel. If this bit = 1, for all modes hard-
ware will adjust the vertical position of the first line of the display so that the image is centered ver-
tically on the panel.
If vertical expansion is active (i.e. all conditions for a vertical expansion mode are met; see appro-
priate bit description in AUX[7]), then the setting of this bit is ignored and auto-centering is dis-
abled. If CRT mode is enabled (AUX[0B] bit 1 = 1) then auto-centering is disabled and this bit has
no effect.
Panel Configuration Bit 0
See Panel Configuration Bits 3:1, AUX[02] bits 6:4.
Force
Overscan
Low
Grn-only/
NTSC GS
Weighting
X12-SP-001-07
Reverse/
Normal
Graphics
Reverse/
Normal
Text
Hardware Functional Specification
Auto-
Centering
Enable
Panel
Config
Bit 0
SP1-91