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LM1238 Datasheet(PDF) 20 Page - National Semiconductor (TI) |
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LM1238 Datasheet(HTML) 20 Page - National Semiconductor (TI) |
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20 / 24 page ![]() Control Register Definitions (Continued) 21 0 1 1 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 www.national.com 20 |
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