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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST92196A датащи(PDF) 142 Page - STMicroelectronics |
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ST92196A датащи(HTML) 142 Page - STMicroelectronics |
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142 / 268 page  142/268 - ON SCREEN DISPLAY CONTROLLER (OSD) OSD CONTROLLER (Cont’d) 8.5.8.2 Horizontal Shift and Row Character Count Address in Segment 22h: 2p + 2 (Bits 15:8), 2p + 3 (Bits 7:0). See Figure 59. For each row to be displayed, the number of char- acters in the row, and the horizontal position of the row on the screen need to be specified. Let’s assume that the start address of the current row buffer is 2p (even address). Bits 15:10 = RCN[5:0] Row Character Count These bits define the number of characters to dis- play in the current row. The Display controller allows to display from 1 to 63 characters (in parallel mode) or 61 (in serial mode, as the first 2 bytes are taken as attributes).. For example, a 36 character row requires pro- gramming RCN[5:0] = 24h. Bits 9:0 = HS[9:0] Horizontal Shift These bits define the horizontal shift value. They specify, in terms of number of Pixel clock periods, the horizontal shift applied from the leading edge of the Hsync pulse to the beginning of the first dis- played character (1st character in parallel modes, 3rd character in serial mode). Refer to Figure 65. Loading any value smaller than 01h is forbidden. The result is given by the formula: Horizontal shift = [HS[9:0]+ 47] * (2*PIXCLK) (where PIXCLK is the clock issued from the Skew Corrector). Refer to the Timing and Clock Control chapter for programming information. Figure 65. Row Position 15 8 7 0 RCN5 RCN4 RCN3 RCN2 RCN1 RCN0 HS9 HS8 HS7 HS6 HS5 HS4 HS3 HS2 HS1 HS0 ST92x196 Displayed Row Event Line (Vertical Shift) Horizontal Shift |
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