SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 95

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

Graphics Controller Registers
SPC8104
Graphics Controller Index/Data Register
3CEh RW
n/a
00 Set/Reset Register RW
n/a
01 Enable Set/Reset Register RW
n/a
02 Color Compare Register RW
n/a
03 Data Rotate Register RW
n/a
04 Read Map Select Register RW
n/a
05 Mode Register RW
RO Status
Read as 0
06 Miscellaneous Register RW
n/a
07 Color Don’t Care Register RW
n/a
08 Bit Mask Register RW
bit 7
index 05 Mode Register bit 6 - the Dummy 256 Colour Select bit is a read/write bit that has no
effect in hardware. This bit is provided for compatibility with some software that expects to use
the value stored in this VGA-defined register bit to determine if mode 13h is set.
412-1.0
3CFh RW
n/a
n/a
n/a
n/a
n/a
n/a
Dummy 256
Colour
Select
(see note)
n/a
n/a
bit 6
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
n/a
n/a
n/a
n/a
n/a
n/a
Shift
Register
Interleave
n/a
n/a
bit 5
n/a
n/a
n/a
n/a
bit 1
n/a
Odd/Even
Plane Select
n/a
n/a
bit 4
Graphics Data Write Mask
Logic Function Select
X15-SP-001-08.1
bit 3
Set/Reset
Plane 3
Enable Set/
Reset Plane
3
bit 3
bit 0
n/a
Read Mode
Select
bit 1
bit 3
bit 3
Display Memory Map
bit 2
Set/Reset
Plane 2
Enable Set/
Reset Plane
2
bit 2
n/a
RO Status
Read as 0
bit 0
bit 2
bit 2
bit 2
Graphics Controller Index
Compare Plane Select
Hardware Functional Specification
Reference Color
Data Rotate Count
bit 1
Set/Reset
Plane 1
Enable Set/
Reset Plane
1
bit 1
bit 1
bit 1
bit 1
Odd Even
Chain Select
bit 1
bit 1
Read Plane Select
Write Mode Select
bit 0
Set/Reset
Plane 0
Enable Set/
Reset Plane
0
bit 0
bit 0
bit 0
bit 0
Graphics
Mode
bit 0
bit 0
SP1-69