LM1276AAA National Semiconductor, LM1276AAA Datasheet - Page 45

• Manufacturer Part Number: LM1276AAA
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

C2B0
Blue
Auto Size Registers
Attribute Table and Enhanced Features
Each display character and SL in the Display Page RAM will have a 4-bit Attribute Table entry associated with it. The user should
note that two-color display characters and four-color display characters use two different Attribute Tables, effectively providing 16
attributes for two-color display characters and 16 attributes for four-color display characters.
For two-color characters, the attribute contains the code for the 9-bit foreground color (Color 1), the code for the 9-bit background
color (Color 0), and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing, Bordering, etc.).
For four-color characters, the attribute contains the code for the 9-bit Color 0, the code for the 9-bit Color 1, the code for the 9-bit
Color 2, the code for the 9-bit Color 3, and the character’s enhanced features (Button Box, Blinking, Heavy Box, Shadowing,
Bordering, etc.).
TWO COLOR ATTRIBUTE FORMAT
The address range for an attribute number, 0 ≤ n ≤ 15, is provided in Table 25.
FOUR COLOR ATTRIBUTE FORMAT
The address range for an attribute number, 0 ≤ n ≤ 15, is provided in Table 25.
X
Bits 2–0
Bit 3
Bits 7-4
Bits 8–0
Bits 17–9
Bits 21–18
Bits 31–22
X
Color 1 - Green
C1G[2:0]
X
ATT2C1n (0x8441+n*4)
ATT2C3n (0x8443+n*4)
Reserved and should be set to zero.
When enabling this bit, the H Flyback input is internally received from the H Sync input.
Reserved and should be set to zero.
These nine bits determine the background color (color1), which is displayed when the
corresponding OSD pixel is a 0.
These nine bits determine the foreground color (color2), which is displayed when the
corresponding OSD pixel is a 1.
These are the enhanced feature (EF) bits, which determine which feature is applied to the
displayed character. The features and their corresponding codes are shown in Table 24.
Reserved and should be set to zero.
X
Bits 21–18
0000b
0001b
0010b
0100b
0101b
1000b
1001b
1010b
0011b
0110b
0111b
1011b
1100b
1101b
1110b
1111b
Reserved
X
(Continued)
Color 1 - Red
C1R[2:0]
TABLE 24. Enhanced Feature Descriptions
X
Normal Display
Blinking
Shadowing
Bordering
RESERVED
RESERVED
RESERVED
RESERVED
Raised Box
Blinking and Raised Box
Depressed Box
Blinking and Depressed Box
Heavy Raised Box
Blinking and Heavy Raised Box
Heavy Depressed Box
Blinking and Heavy Depressed Box
X
X
Color 0 - Blue
45
C0B[2:0]
Feature Description
X
X
Color 0 - Green
ATT2C2n (0x8442+n*4)
ATT2C0n (0x8440+n*4)
Enhanced Feature
C0G[2:0]
EFB[3:0]
Color 0 - Red
C0R[2:0]
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Color 1 -
C1B[2:1]