LM1237BDBC/NA National Semiconductor, LM1237BDBC/NA Datasheet - Page 29

• Manufacturer Part Number: LM1237BDBC/NA
• Description: Video ICs, 150MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs
• Manufacturer: National Semiconductor

Display Page RAM
Notes:
• In order to centralize the three characters above the five characters on the row below, a “transparent” blank character has
• In order to create the transparent skipped lines between the two character rows, a row of no characters has been used,
• In this example, the transparent character is defined by the 2-color attribute table entry ATT0. Bit 4 of Frame Control Register
• The top row of characters are yellow on black; in this example, these are defined by the 2-color attribute table entry ATT9.
• The second row of characters are blue on black; in this example, these are defined by the 2-color attribute table entry ATT10.
• The black background of the characters are not transparent because ATT9 and ATT10 are used.
• The data shown in Table 12. Example 3 I
been used as the first character on the row.
resulting in a RE, SL, RE, SL control code sequence.
1 must be set to indicate that the black color is to be translated as transparent (see section Control Register Definitions).
Data Sent
0xBA
0xBA
0x00
0x80
0x00
0x00
0x80
0x02
0x80
0x09
0x02
0x03
0x04
0x01
I
Chip address (See the Microcontroller Interface Section)
Address LSB
Address MSB
Use Attribute table 0x00 for the following characters
Skip 2 lines Command
Character “ ”
I
I
Chip address (See the Microcontroller Interface Section)
Address LSB
Address MSB
Use Attribute table 0x09 for the following characters
Character “A”
Character “B”
Character “C”
Row-End (RE) Command
I
I
2
2
2
2
2
C start condition (See the Microcontroller Interface Section)
C stop condition (See the Microcontroller Interface Section)
C start condition (See the Microcontroller Interface Section)
C stop condition (See the Microcontroller Interface Section)
C start condition (See the Microcontroller Interface Section)
(Continued)
TABLE 12. Example 3 I
2
C Sequences is sent to the LM1237 in four I
FIGURE 23. Example 3 OSD
Description
29
2
C Sequences
2
C transmissions.
20023434
RAM Address
0x8000
0x8001
0x8002
0x8003
0x8004
0x8005
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