LM1247 National Semiconductor, LM1247 Datasheet - Page 31

• Manufacturer Part Number: LM1247
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

Building Display Pages
EXAMPLE 3
A blue message on a yellow background is to be displayed which has two lines of different lengths. Three transparent skipped
lines are required between the character lines. Again, we will use 2-color characters. This is shown in Figure 27.
Notes:
• The character codes used are from bank 4 of the sample font shown in Figure 29 through Figure 36. The bank select settings
• In order to center the first line with the second, two transparent blanks will begin the first line.
• The transparent skip lines and blank characters are obtained by using attribute 0 for the SL and the two blanks, and setting
• If instead we used attributes 8 and 9 for this example, the black would not be transparent, since transparency only operates
• The data shown in Table 20 is sent to the LM1247 in two I
from Example 1 will be used.
bit 4 of the Frame Control Register 1 to 0. (See Control Register Definitions section).
on black colors in the first 8 attributes.
Data Sent
0xBA
0xBA
0xC5
0xC6
0xC7
0x80
0x00
0x07
0x80
0x01
0x08
0x80
0x02
0x01
0x00
Address MSB
Use Attribute 0 for the “D”
Character “D”
I
I
LM1247 Slave Write Address
Address LSB
Address MSB
Use Attribute 1 for the “E”
Character “E”
I
I
LM1247 Slave Write Address
Address LSB
Address MSB
Use Attribute 2 for the “F”
Character “F”
End-of-Line (EOL) Command
End-of-Screen (EOS) Command
I
2
2
2
2
2
C stop condition
C start condition
C stop condition
C start condition
C stop condition
TABLE 19. Example 2 Data Transmissions (Continued)
(Continued)
FIGURE 27. Example 3 OSD
Description
2
31
C transmissions.
20048442
RAM Address
0x800A
0x8006
0x8007
0x8008
0x8009
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