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LM1238 Datasheet(PDF) 19 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) 19 Page - National Semiconductor (TI)

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LM1238 Address Map
TABLE 3. I
2C Address Space
Address Range
R/W
Description
0x0800h-0x0805h
R/W
OSD register set up data
0x0810h-0x081Fh
R/W
Preamp register set up data
Pre-Amp Interface I
2C Registers
TABLE 4. LM1238 Pre-Amplifier Interface I
2C Registers
Register
Address
Default
D7
D6
D5
D4
D3
D2
D1
D0
BGAINCTRL
0x0810
0xE0h
RSV
BGAIN[6:0]
GGAINCTRL
0x0811
0xE0h
RSV
GGAIN[6:0]
RGAINCTRL
0x0812
0xE0h
RSV
RGAIN[6:0]
CONTRCTL
0x0813
0xE0h
RSV
CONTRAST[6:0]
DAC2CTRL
0x0814
0x80h
DAC2[7:0]
DAC3CTRL
0x0815
0x80h
DAC3[7:0]
DAC1CTRL
0x0816
0x80h
DAC1[7:0]
DAC4CTRL
0x0817
0x80h
DAC4[7:0]
DCF/OSD-Con/DC
0x0818
0x94h*
RSV
DCONFIG[1..0]
OSD_CONT[1..0]
DC_OFFSET[2..0]
GLOBALCTRL
0x0819
0x00h*
D_ID[5:0]
PS
BV
CLMP/PLL/VBL/OOR
0x81E
0x16h*
INT
NV
CLMP
FRE
OOR
VBL
PFR[1:0]
SRTSTCTRL
0x81F
0x00h*
RSV
RSV
RSV
RSV
RSV
RSV
RSV
SRST
TABLE 5. OSD Interface I
2C Registers
Register
Address
Default
D7
D6
D5
D4
D3
D2
D1
D0
BAR_CNTL
0x0800h
0x00h
BAR[4:0]
CNTL[2:0]
ICN_INDX
0x0801h
0x00h
ICON[3:0]
INDEX[2:0]
HORIZ
0x0802h
0xD0h
PPL[1:0]
HPOS[5:0]
VERT
0x0803h
0xCCh
HT[1:0]
VPOS[5:0]
ALT
0x0804h
0x04h
RSV
RSV
ASO1
ASO0
ALT[3:0]
VERTBLNK
0x0805h
0x10h
RSV
VB[6:0]
Control Register Definitions
OSD INTERFACE REGISTERS
Bar Indicator and OSD Interface Control Register (I
2C address 0x0800h)
Register Name (address): BAR_CNTL (0x0800h)
7
654321
0
BAR4
BAR3
BAR2
BAR1
BAR0
CNTL2
CNTL1
CNTL0
Bits 2–0 OSD Controls. These three bits turn on and off the OSD window and allow the up, down, left and right icons to be
highlighted in color 1 out of the 8 colors available.
Note that when the highlight bits are turned on, the control codes will be reset to 001b, after 32 vertical field periods.
Reading back the register more than 32 fields after a write to these bits will give 00 for the bits 1 and 2.
21
0
0
0
0
Turn off OSD
0
0
1
Turn on OSD and normal button colors
0
1
0
Turn on OSD and highlight up arrow for 32 vertical periods.
1
0
0
Turn on OSD and highlight down arrow for 32 vertical
periods.
0
1
1
Turn on OSD and highlight “+” for 32 vertical periods.
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