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参数资料
| 型号： | LM1238AAF/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封装： | N24D |
| 文件页数： | 13/24页 |
| 文件大小： | 1207K |
| 代理商： | LM1238AAF/NA |
Control Register Definitions (Continued)
21
0
1
Turn on OSD and highlight “” for 32 vertical periods.
Bits 7–3 Bar Indicator. These five bits determine the length of the bar indicator on a scale of 0–31. A value of 0 results in no
indicator. 31 results in a full scale indicator.
Icon Select and Index Position Register (I
2C address 0x0801h)
Register Name (address): ICN_INDX (0x0801h)
7
654321
0
ICN3
ICN2
INC1
INC0
INDX3
INDX2
INDX1
INDX0
Bits 3–0 Index Pointer. These four bits determine the location of the pointer on a scale of 0–15. A value of 0 positions the pointer
at the top. A value of 15 positions it at the bottom.
Bits 7–4 Icon Select. These four bits determine the icon set (0 through 15) that is displayed.
Horiz. Pixels Per Line and OSD Horiz. Position Register (I
2C address 0x0802h)
Register Name (address): HORIZ (0x0802h)
7
654321
0
PPL1
PPL0
HPOS5
HPOS4
HPOS3
HPOS2
HPOS1
HPOS0
Bits 5–0 Horizontal Position. These six bits set the position of the image relative to the blanking pulse in increments of 8 pixels
(i.e., one character cell).
Bits 7–6 Pixels Per Line. These two bits set the horizontal size of the image, in pixels per line.
TABLE 6. Pixels Per Line vs Register Value
Pixel Per Line
Register Value
Pixels Per Line
00
130
01
176
10
240
11
352
OSD Vertical Height and Vertical Position Register (I
2C address 0x0803h)
Register Name (address): VERT (0x0803h)
7
654321
0
HT1
HT0
VPOS5
VPOS4
VPOS3
VPOS2
VPOS1
VPOS0
Bits 5–0 Vertical Position. This six bit value sets the position of the image relative to the vertical blank pulse in increments of 8
OSD lines (one character cell height).
Bits 7–6 Vertical Height. This two bit value sets the nominal height of the OSD by controlling the average number of OSD lines
per frame.
TABLE 7. OSD Lines Per Field vs Vertical Height Register
Vertical Height
Register Value
OSD Lines Per Field
00
95
01
130
10
180
11
260
LM1238
www.national.com
20
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