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參數(shù)資料
| 型號： | LM1236 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 254 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254字符OSD光盤，512個字符RAM和4 DAC的內置 |
| 文件頁數(shù)： | 31/43頁 |
| 文件大?。?/td> | 1898K |
| 代理商： | LM1236 |
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Building Display Pages
(Continued)
TABLE 17. Auto Attribute Mode
ATTRIBUTE Byte
X
X
0
0
ATT[3:0]
When bits 6–5 are 0, the 4-bit attribute code will be automatically applied to all the character codes transmitted after this attribute
byte, as in the LM1237 and LM1247. This mode is useful for sending character codes that use the same attribute. No further
attribute codes can follow without stopping and restarting a new transmission. The Page RAM address is automatically
incremented starting with the initial LSB and MSB address in the beginning of the sequence.
TWO BYTE COMMUNICATION MODE
The Two Byte Communication mode allows different attribute and character codes to be sent within one transmission without
stopping. The attribute byte is shown in
Table 18
, and the sequence of transmitted bytes is shown in
Table 19
. Either another
attribute & character code pair or a STOP must follow after each character code. The Page RAM address is automatically
incremented just as in the Auto Attribute mode above.
TABLE 18. Two Byte Communication Mode
ATTRIBUTE Byte
X
X
0
1
ATT[3:0]
TABLE 19. Sequence of Transmitted Bytes
HALF RANDOM ADDRESS MODE
The Half Random Address mode allows different attribute and character codes to be sent within one transmission in the same
way as the Two Byte Communication mode. The advantage of Half RandomAddressing over the Two Byte mode is that the Page
RAM addresses do not have to be written to in a sequential order. However, the Page RAM addresses cannot be entirely random,
as they must be within one half of the Page RAM. A new transmission must be restarted to switch to another half of the Page
RAM. The Page RAM address is not automatically incremented in this mode. This mode is very useful for modifying character
codes and attributes in the first 256 locations of the Page RAM. The attribute byte is shown in
Table 20
, and the sequence of
transmitted bytes is shown in
Table 21
. Either another LSB address & attribute & character code or a STOP must follow after each
character code.
TABLE 20. Half Random Address Mode
ATTRIBUTE Byte
X
X
1
0
ATT[3:0]
TABLE 21. Sequence of Transmitted Bytes
FULL RANDOM ADDRESS MODE
The Full RandomAddress mode is very similar to the Half RandomAddress mode. However, the advantage is that the Page RAM
addresses can now be entirely random. There is no longer a restriction to only one half of the Page RAM. The Page RAM address
is not automatically incremented in this mode. This is very useful for modifying character codes and attributes anywhere in the
Page RAM without starting a new transmission sequence. The Full Random Address mode is the most flexible mode of
transmission. The attribute byte is shown in
Table 22
, and the sequence of transmitted bytes is shown in
Table 23
. Either another
LSB address & MSB address & attribute & character code or a STOP must follow after each character code.
TABLE 22. Full Random Address Mode
ATTRIBUTE Byte
X
X
1
1
ATT[3:0]
L
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相關代理商/技術參數(shù) |
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|---|---|
| LM1236AAA/NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1237 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
| LM1237_04 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
| LM1237AAF/NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs |
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