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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) 137 Page - STMicroelectronics |
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ST92196A датащи(HTML) 137 Page - STMicroelectronics |
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137 / 268 page  137/268 - ON SCREEN DISPLAY CONTROLLER (OSD) OSD CONTROLLER (Cont’d) 8.5.7 Programming the Mouse Pointer The Mouse Pointer is programmed using two con- trol bits stored in registers, and three 16-bit words located in OSDRAM (Figure 59). The mouse pointer can be defined as any of the ROM Font characters. The 18x26 matrix is used to represent it. Mouse Pointer Attributes The three 16-bit word attributes are located in OS- DRAM: – Mouse Coding Data – Mouse Pointer Vertical Position – Mouse Pointer Horizontal Position Mouse pointer interrupt control The Mouse Pointer has a dedicated interrupt source which uses the same interrupt line as the OSD. Both interrupts (Mouse Pointer and OSD) are simply ORed at hardware level and forwarded to the CPU. The Mouse pointer interrupt is generated as soon as the Mouse matrix processing is completed. The Mouse Pointer interrupt generation is auto- matically enabled as soon as the Mouse Pointer is activated. To help identify the actual interrupt source, a flag (MOIT) is associated with the Mouse Pointer inter- rupt: this flag is activated when the mouse inter- rupt is generated and must be cleared by software. This bit is not the image of the interrupt transient condition but it keeps trace of the interrupt event until the software erases it. This bit must be reset by writing to the Enable register. The Mouse Point- er interrupt is generated regardless of this flag val- ue. |
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