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LM1238 Datasheet(PDF) 21 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM1238
Description  110 MHz I2C Compatible RGB Preamplifier with Internal Simple OSD Generator and 4 DACs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM1238 Datasheet(HTML) 21 Page - National Semiconductor (TI)

 
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Control Register Definitions (Continued)
Icon Alternate Period Control Register (I
2C address 0x0804h)
Register Name (address): ALT (0x0804h)
7
654321
0
RSV
RSV
ASO1
ASO0
ALT3
ALT2
ALT1
ALT0
Bits 3–0 Icon Alternate Period. These four bits set the period at which the icon will switch between images, in increments of eight
vertical fields.
Bits 5–4 Alternate Sequence Override. These two bits enable the automatic alternating sequence of icons, or allow the icon to
be set to one of the three alternative screens.
TABLE 8. Alternating Icon Sequence Override
Sequence Override
Register Value
Effect
00
Automatic Alternating Sequence
01
Set for Icon Screen 0
10
Set for Icon Screen 1
11
Set for Icon Screen 2
Bits 7–6 Reserved.
Vertical Blank Duration Control Register (I
2C address 0x0805h)
Register Name (address): VERTBLNK (0x0805h)
7
654321
0
RSV
VB6
VB5
VB4
VB3
VB2
VB1
VB0
Bits 6–0 Vertical Blank Duration. These seven bits set the duration of the VBLANK signal in numbers of horizontal scans.
Bit 7
Reserved.
PRE-AMPLIFIER INTERFACE REGISTERS
Blue Channel Gain Control Register (I
2C address 0x0810h)
Register Name (address): BGAINCTRL (0x0810h)
7
654321
0
RSV
BG
BG
BG
BG
BG
BG
BG
Bits 6–0 Blue Channel Gain Control. These seven bits determine the gain for the Blue Channel.
Bit 7
Reserved.
Green Channel Gain Control Register (I
2C address 0x0811h)
Register Name (address): GGAINCTRL1 (0x0811h)
7
654321
0
RSV
GG
GG
GG
GG
GG
GG
GG
Bits 6–0 Green Channel Gain Control. These seven bits determine the gain for the Green Channel.
Bit 7
Reserved.
Red Channel Gain Control Register (I
2C address 0x0812h)
Register Name (address): RGAINCTRL1 (0x0812h)
7
654321
0
RSV
RG
RG
RG
RG
RG
RG
RG
Bits 6–0 Red Channel Gain Control. These seven bits determine the gain for the Red Channel.
Bit 7
Reserved.
www.national.com
21


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