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參數(shù)資料
| 型號： | LM1247 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大?。?/td> | 3141K |
| 代理商： | LM1247 |
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Building Display Pages
(Continued)
TABLE 18. Example 1 Data Transmissions
(Continued)
Description
Data Sent
0x04
0x01
0x00
0x05
0x06
0x07
0x00
RAM Address
8003
8004
8005
8006
8007
8008
8009
Character “C”
End-of-Line (EOL) code
Skip 0 lines
Character “D”
Character “E”
Character “F”
End-of-Screen (EOS) code
I
2
C stop condition
EXAMPLE 2
A 3x2 character matrix of characters on a black background is to be displayed on the screen using 2-color character codes. Two
gray skip lines are desired below the first line of characters, and 3 gray skip lines are desired below the second line. This is shown
in
Figure 26
.
The first line of characters will use attribute 0, the second line will use attribute 0 for the first character, attribute 1 for the second
character, and attribute 2 for the third character. The skip lines will use attribute 3, which we choose to be the inverse of attribute
1.
Notes:
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, we assume bank 4 is selected by Bank Select Register 3, so the two upper bits of the character codes are
both 1’s. Therefore, the code stored in page RAM for the “A” will be 0xC2.
Every line begins with anAC and an SLcode. The first location addressed by the Window 1 StartAddress register must always
contain the SL for the first line of display window
#
1.
If an I
2
C transmission finishes without an EOL code (in the middle of a line) the first byte sent in the next transmission is an
AC.
Every line except the last line of a display window ends with an EOL code. The character immediately after an EOL is always
the SL value for the next line, unless the window contains just one line.
The last character in a display window is an EOS code. The EOS must NOT follow an EOL character.
Table 19
shows the data sent to the LM1247 for the entire image, in 7 transmissions.
TABLE 19. Example 2 Data Transmissions
Data Sent
Description
RAM Address
I
2
C start condition
LM1247 Slave Write Address
Two-color attribute location 0 address LSB
Two-color attribute location 0 address MSB
0xBA
0x40
0x84
20048441
FIGURE 26. Example 2 OSD
L
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