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S1D13706F00A Datasheet(PDF) 52 Page - Epson Company |
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S1D13706F00A Datasheet(HTML) 52 Page - Epson Company |
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52 / 94 page  46 EPSON S1D13305 Series Technical Manual 9.3. Cursor Control 9.3.1. Cursor register function The S1D13305 series cursor address register functions as both the displayed cursor position address register and the display memory access address register. When ac- cessing display memory outside the actual screen memory, the address register must be saved before accessing the memory and restored after memory access is complete. Figure 34. Cursor addressing Note that the cursor may disappear from the display if the cursor address remains outside the displayed screen memory for more than a few hundred milliseconds. 9.3.2. Cursor movement On each memory access, the cursor address register changes by the amount previously specified with CSRDIR, automatically moving the cursor to the desired location. 9.3.3. Cursor display layers Although the S1D13305 series can display up to three layers, the cursor is displayed in only one of these layers: Two-layer configuration: First layer (L1) Three-layer configuration: Third layer (L3) The cursor will not be displayed if it is moved outside the memory for its layer. Layers may be swapped or the cursor layer moved within the display memory if it is necessary to display the cursor on a layer other than the present cursor layer. Cursor display address register Address pointer Cursor register Although the cursor is normally displayed for character data, the S1D13305 series may also display a dummy cursor for graphical characters. This is only possible if the graphics screen is displayed, the text screen is turned off and the microprocessor generates the cursor control ad- dress. Figure 35. Cursor display layers Consider the example of displaying Chinese characters on a graphics screen. To write the display data, the cursor address is set to the second screen block, but the cursor is not displayed. To display the cursor, the cursor address is set to an address within the blank text screen block. Since the automatic cursor increment is in address units, not character units, the controlling microprocessor must set the cursor address register when moving the cursor over the graphical characters. D = 1 FC1 = 0 FC0 = 1 FP1 = 0 FP0 = 0 FP3 = 0 FP2 = 1 Cursor ON Block screen 1 (character screen) OFF Block screen 2 (graphics screen) ON DISPLAY CONTROL FUNCTIONS |
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