參數(shù)資料
型號(hào)： 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(gè)字符RAM和4 DAC的內(nèi)置
文件頁(yè)數(shù)： 29/43頁(yè)
文件大?。?/td> 1898K
代理商： LM1236
LM1236 Address Map
(Continued)
TWO-COLOR ATTRIBUTE RAM
This address range (0x8440–0x8497) contains the attribute lookup tables used for displaying two-color characters. There are 16
groups of 4 bytes each according to the format shown in
Table 13
. The attributes are stored starting with Color 0 (background)
and each color is stored red first, green second and then blue. They may be written or read using the following address format:
Address = 0x8440 + (N
*
0x4) + B
where: N = Attribute number (0x0
≤
N
≤
0xF)
B = Attribute byte number (0x0
≤
B
≤
0x3)
When reading, it is OK to read only one, two, or all three bytes. When writing more than one 2-color attribute using the auto
increment feature, all four bytes must be written. When writing, bytes 0 through 2 must be written in order. Bytes 0 through 2 will
take effect after byte 2 is written. Since byte 3 contains all reserved bits, this byte may be written, but will have no effect. Any bits
marked as “X” are reserved and should be written to with zeros and should be ignored when the register is read.
TABLE 13. LM1236 Two-Color Attribute Registers
Register
ATT2C0n
ATT2C1n
ATT2C2n
ATT2C3n
Address
0x8440 + 4n
+1
+2
+3
D7
D6
D5
D4
D3
D2
D1
D0
C0B[1:0]
C1B[0]
X
X
C0G[2:0]
C0R[2:0]
C1G[2:0]
C1R[2:0]
C0B[2]
X
X
EF[3:0]
C1B[2:1]
X
X
X
X
X
X
FOUR-COLOR ATTRIBUTE RAM
This address range (0x8500–0x857F), contains the attribute lookup tables used for displaying four-color characters. There are 16
groups of 8 bytes each according to the format shown in
Table 14
. The attributes are stored starting with Color 0 (background)
and each color is stored red first, green second and then blue. They may be written or read using the following address format:
Address = 0x8500 + (N
*
0x8) + B
where: N = Attribute number (0x0
≤
N
≤
0xF)
B = Attribute byte number (0x0
≤
B
≤
0x7)
When writing, bytes 0 through 2 must be written in order and bytes 4 through 6 must be written in order. Bytes 0 through 2 will
take effect after byte 2 is written. Bytes 4 through 6 will take effect after byte 6 is written. Since bytes 5 and 7 contain all reserved
bits, these bytes may be written, but no effect will result. When reading, it is OK to read only one, two, or all three bytes. If writing
more than one 4-color attributes using the auto increment feature, all eight bytes must be written. Any bits marked as “X” are
reserved and should be written to with zeros and should be ignored when the register is read.
TABLE 14. LM1236 Four-Color Attribute Registers
Register
ATT4C0n
ATT4C1n
ATT4C2n
ATT4C3n
ATT4C4n
ATT4C5n
ATT4C6n
ATT4C7n
Address
8500 + (n*8)
+1
+2
+3
+4
+5
+6
+7
D7
D6
D5
D4
D3
D2
D1
D0
C0B[1:0]
C1B[0]
X
X
C2B[1:0]
C3B[0]
X
X
C0G[2:0]
C0R[2:0]
C1G[2:0]
C1R[2:0]
C0B[2]
X
X
EF[3:0]
C1B[2:1]
X
X
X
X
X
X
C2G[2:0]
C2R[2:0]
C3G[2:0]
X
X
C3R[2:0]
X
X
C2B[2]
X
X
X
X
X
X
C3B[2:1]
X
X
L
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