LM1247 National Semiconductor, LM1247 Datasheet - Page 28

• 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

www.national.com
Building Display Pages
Notes:
• The black background is Color 0 and the gray foreground is Color 1 which we will store in two-color attribute location 5 at
• The Enhanced Feature portion will be set to Normal (no blinking, shadowing or button boxes, etc.)
• The character codes for “A”, “B”, etc. are from bank 4 of the sample font shown in Figure 29 through Figure 36.
• For this example, bank 4 is selected by Bank Select Register 0, and therefore the two upper bits of the character codes are
• The data shown in Table 18 is sent to the LM1247 in two transmissions, one for the attribute and one for the Page data. Also,
• Every line must begin with an AC and an SL code. The first location addressed by the Window 1 Start Address register must
• Every line except the last line of a display window must end with an EOL code. The character immediately after an EOL is
• The last code in a display window must be an EOS character. The EOS must NOT follow an EOL character.
• The attributes that are associated with EOL and EOS characters are not used, so it is most efficient just to allow them to be
• See the Microcontroller Interface Section for I
0x8454–0x8457.
both 0.
additional data will need to be sent to position the OSD window and turn it on.
always be contain the SL for the first line of display window # 1.
always the SL value for the next line, unless the window contains just one line.
the same value as the attribute associated with the previous display characters.
Data Sent
0xBA
0xDA
0xBA
0x54
0x84
0x00
0x02
0x00
0x00
0x80
0x05
0x00
0x02
0x03
I
LM1247 Slave Write Address
Two-color attribute location 5 address LSB
Two-color attribute location 5 address MSB
Attribute Byte 1 of 4
Attribute Byte 2 of 4
Attribute Byte 3 of 4
Attribute Byte 4 of 4
I
I
LM1247 Slave Write Address
Address LSB
Address MSB
Use Attribute 5 for the following characters
Skip 0 lines code
Character “A”
Character “B”
2
2
2
C start condition
C stop condition
C start condition
TABLE 18. Example 1 Data Transmissions
(Continued)
FIGURE 25. Example 1 OSD
2
C compatible start, stop and addressing information.
Background (Color 0): Red = 000b, Green = 000b and
Blue = 000b.
Foreground (Color 1): Red = 101b, Green = 101b, Blue
= 101b, and Enhanced Feature = 0000b.
Description
28
20048440
RAM Address
8454
8455
8456
8457
8000
8001
8002