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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) 124 Page - STMicroelectronics |
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ST92196A датащи(HTML) 124 Page - STMicroelectronics |
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124 / 268 page  124/268 - ON SCREEN DISPLAY CONTROLLER (OSD) OSD CONTROLLER (Cont’d) 8.5.5 Programming the Display The row-wise RAM buffer contains the description of the characters to display: – Row and character attributes (color, shape etc.) – Horizontal shift code – Character codes (addressing the Font ROM) While one row buffer is displayed on the screen, the CPU has time to prepare the content of the next character row by filling up the second row buffer. At the time the next row must be displayed, the Display controller will point to the second row buffer, allowing the CPU to start loading data into the first row buffer for the following row. An inter- rupt request is generated each time the buffer pointer toggles. Note: The display and the mouse share the same interrupt line. In configurations with mouse, the DINT and MOINT bits in the OSDFBR register can be used to determine the interrupt cause. The Vertical location of the next character row on the screen is programmed by software through the Event Line value (Refer to Figure 65). The vertical position of the beam is memorized by the Line counter which counts the TV horizontal synchroni- zation pulses (called here "Scan Line"). When the Scan Line counter matches the Event Line value the buffer toggle mechanism is activated. 8.5.5.1 OSDRAM Mapping The OSDRAM is mapped in segment 22h of the memory space. In addition to row buffers, it is used to store color palettes and information concerning mouse point- er. Note: The reset value of the OSDRAM contents is undefined. General Overview The Figure 59 gives a general overview of the OS- DRAM mapping. |
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