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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) 141 Page - STMicroelectronics |
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ST92196A датащи(HTML) 141 Page - STMicroelectronics |
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141 / 268 page  141/268 - ON SCREEN DISPLAY CONTROLLER (OSD) OSD CONTROLLER (Cont’d) 8.5.8 Programming the Row Buffers The 2 row buffers are based on the same structure (Figure 59): – Next Buffer Start Address – Row Mode – Horizontal Shift – Row Character Count 8.5.8.1 Next Buffer Start Address And Row Mode Address in Segment 22h: 2p (Bits 15:8), 2p + 1 (Bits 7:0). See Figure 59. To display more than 1 character row on the screen, you must specify the start address of the next OSDRAM row buffer (the row buffer contain- ing the next row to be displayed when the current row is completely processed). Two bytes are re- served for this in the OSDRAM. (See Figure 59). As it is possible to display each row using different modes (serial, basic parallel, and extended paral- lel), the row mode has to be specified for the cur- rent row buffer. Bits 15:14 = WM[2:1] Serial/parallel Row Mode control These bits define the row mode for the buffer de- fined by the Next Buffer Start Address (NSA[8:0] bits). Refer to Table 25 for details. Table 25. Serial/Parallel mode control Bits 13:9 = Free for the user Bits 8:0 = NSA[8:0] Next buffer Start Address These bits define the start address of the next row buffer. As row buffer start addresses are always even ad- dresses, the NSA0 is not implemented, and Bit 0 is forced to 0 by hardware. 15 8 7 0 WM2 WM1 NSA8 NSA7 NSA6 NSA5 NSA4 NSA3 NSA2 NSA1 0 WM2 WM1 Mode 1 1 (reserved) 1 0 Extended Parallel 0 1 Basic Parallel 0 0 Serial |
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