SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 86

• Manufacturer Part Number: SPC8104
• Description: VGA LCD CONTROLLER
• Manufacturer: S-MOS Systems

bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Hardware Functional Specification
02 LCD Interface Register RW
n/a
SP1-60
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
MIM Panel
Select
Graphics VExpand
This bit is used to enable vertical expansion of 400 line graphics mode on the LCD display. If this bit
is 0, then vertical expansion of graphics mode is disabled. If this bit is set to 1, then 400 line graph-
ics modes are expanded vertically to 480 lines to fill the screen. Auto-centering is disabled when
graphics mode vertical expansion is in effect. All the following conditions must be true for graphics
mode vertical expansion to occur:
1) Graphics VExpand Enable =1
2) 400 line mode set, i.e. CRTC register 12h and associated overflow bits = 18Fh
3) Graphics mode set, i.e. Graphics Controller register 06h bit 0 = 1
Text VExpand
This bit is used to enable vertical expansion of 400 line text mode on the LCD display. If this bit is 0,
then vertical expansion of text mode is disabled. If this bit is set to 1, then 400 line text modes are
expanded vertically to 480 lines to fill the screen. Auto-centering is disabled when text mode verti-
cal expansion is in effect. All the following conditions must be true for text mode vertical expansion
to occur:
1) Text VExpand Enable =1
2) 16 point font is set, i.e. the 5 least significant bits of CRTC register 09h = 0Fh
2) 400 line mode set, i.e. CRTC register 12h and associated overflow bits = 18Fh
3) Text mode set, i.e. Graphics Controller register 06h bit 0 = 0
Green Only/NTSC GS Weighting Select
The 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 64x4 LCD gray scale lookup table. When this bit is set to 0, RGB
data values are mapped to gray values using NTSC weighting. When this bit set to 1, the green
component of the RGB data is used as the gray value.
Graphics Reverse
When this bit is 0, then normal display attributes are enabled. When this bit is 1, then inverse video
is displayed on the LCD display when in graphics modes (GRC[06] bit 0 = 1).
Text Reverse
When this bit is 0, then normal display attributes are enabled. When this bit is 1, then inverse video
is displayed on the LCD display when in text modes (GRC[06] bit 0 = 0).
Auto-Center 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 panel. When the Auto-Centering Enable bit is 0, then the
auto-center function is disabled and all modes will be displayed with the first line at the top of the
panel. If this bit is set to 1, then auto-centering is enabled and for all modes hardware will adjust the
vertical position of the first line of the display so that the image is centered vertically on the panel.
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 is set to 0, the cursor, text or graphics pixels blink at
their normal rates. If this bit is set to 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 normal and slow settings, the text mode cursor always blinks at twice the frequency of any
blinking characters.
Single/Dual
Panel
4/8 Bit Panel
Interface
X15-SP-001-08.1
bit 1
Suspend Refresh Clk Source
Select
bit 0
n/a
32/4 msec
Refresh
Select
412-1.0
SPC8104