LM1238AAD/NA NOPB National Semiconductor, LM1238AAD/NA NOPB Datasheet - Page 20

• Manufacturer Part Number: LM1238AAD/NA NOPB
• Manufacturer: National Semiconductor

Specifications of LM1238AAD/NA NOPB

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Package Type: MDIP
• Lead Free Status / RoHS Status: Compliant

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Control Register Definitions
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
Icon Select and Index Position Register (I
Register Name (address): ICN_INDX (0x0801h)
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
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
Register Name (address): HORIZ (0x0802h)
Bits 5–0 Horizontal Position. These six bits set the position of the image relative to the blanking pulse in increments of 8 pixels
Bits 7–6 Pixels Per Line. These two bits set the horizontal size of the image, in pixels per line.
OSD Vertical Height and Vertical Position Register (I
Register Name (address): VERT (0x0803h)
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
Bits 7–6 Vertical Height. This two bit value sets the nominal height of the OSD by controlling the average number of OSD lines
indicator. 31 results in a full scale indicator.
at the top. A value of 15 positions it at the bottom.
(i.e., one character cell).
OSD lines (one character cell height).
per frame.
PPL1
ICN3
HT1
7
7
7
2
1
1
1
PPL0
ICN2
HT0
TABLE 7. OSD Lines Per Field vs Vertical Height Register
6
6
6
0
1
TABLE 6. Pixels Per Line vs Register Value
Turn on OSD and highlight “−” for 32 vertical periods.
Vertical Height
Register Value
Register Value
Pixel Per Line
HPOS5
VPOS5
INC1
2
5
5
5
C address 0x0801h)
00
01
10
00
01
10
11
11
(Continued)
HPOS4
VPOS4
INC0
2
4
4
4
C address 0x0803h)
2
20
C address 0x0802h)
HPOS3
VPOS3
INDX3
OSD Lines Per Field
3
3
3
Pixels Per Line
130
176
240
352
130
180
260
95
HPOS2
VPOS2
INDX2
2
2
2
HPOS1
VPOS1
INDX1
1
1
1
HPOS0
VPOS0
INDX0
0
0
0