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ST92185B Datasheet(PDF) 94 Page - STMicroelectronics |
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ST92185B Datasheet(HTML) 94 Page - STMicroelectronics |
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94 / 178 page  94/178 ST92185B - ON SCREEN DISPLAY (OSD) ON SCREEN DISPLAY (Cont’d) 7.4.4 Programming the Display All the characteristics of the display are managed by programmable attributes: s Global Attributes s Serial Attributes s Parallel Attributes (active until a superseding serial or parallel attribute). s Cursor Control s Scrolling Control 7.4.4.1 Global Attributes These global attributes are defined through their corresponding registers (see the Register Descrip- tion). Table 15. Global Attributes Global Attributes Description Control Register Display Enable (DE) 0= Display Off (Default) 1= Display On DCM0R R250 (FAh) Page 32 4/3 or 16/9 Format (SF) 0= 4/3 Screen Format (Default) 1= 16/9 Screen Format DCM0R Conceal Enable (CE) 0= Reveal any text defined as concealed by serial attributes (Default) 1= Conceal any text defined as concealed by serial attributes DCM0R Fringe Enable (FRE) 0= Fringe Disabled (Default) 1= If SWE in NCSR register is reset, it acts as Fringe enable (toggle with serial attribute 1Bh). Active on the whole page but not in 80-character mode. DCM0R Global Fringe Enable (GFR) 0= Global fringe mode off 1= Display all text in page in fringe mode DCM0R Global Rounding Enable (GRE) 0= Disabled (Default) 1= Rounding active on the whole page but not in 80-character mode. DCM0R Semi-transparent Mode (STE) 0=Disabled (default) 1=Enabled The Fast Blanking signal is toggled with the double pixel clock rate on Back- ground and full screen area in 40 character mode. Note: Semi-transparent mode shows a visible grid on screen. DCM0R Translucency (HTC and TSLE) The TSLU signal is active when the OSD displays the background and full screen area and is inactive during foreground or if no display. This output pin is used with a Chroma processor to mix the video input with the RGB to get full translucency. NCSR R245 (F5h) Page 32 and FSC- CR R243 Page 32 Half-Tone (HTC and TSLE) The HT signal is active when the OSD displays the background and full screen area and is inactive during foreground or if no display. The HT signal is used with a video processor to perform a contrast reduction. NCSR R245 (F5h) Page 32 and FSC- CR R243 Page 32 40/80 Chars/Row (S/D) 0=Single page (40 Characters per row) (default) 1= Two pages are displayed contiguously (80 Characters per row). In this mode, only serial mode is available. DCM0R Fast Blanking Active Level 0=Display when Fast Blanking output is low (default) 1=Display when Fast Blanking output is high DCM1R R251 (FBh) Page 32 Serial/Parallel Mode (SPM) 0= Serial Mode (Default) 1= Parallel Mode DCM1R Page or Line Display Mode (PM) 0 = Full Page Mode (Default) 23 lines plus 1 header and two status lines. 1= Line Mode DCM1R |
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