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S1D13706F00A Datasheet(PDF) 48 Page - Epson Company |
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S1D13706F00A Datasheet(HTML) 48 Page - Epson Company |
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48 / 94 page  42 EPSON S1D13305 Series Technical Manual 9.2. Screen Configuration 9.2.1. Screen configuration The basic screen configuration of the S1D13305 series is as a single text screen or as overlapping text and graphics screens. The graphics screen uses eight times as much display memory as the text screen. Figure 28 shows the relationship between the virtual screens and the physical screen. 9.2.2. Display address scanning The S1D13305 series scans the display memory in the same way as a raster scan CRT screen. Each row is scanned from left to right until the address range equals C/R. Rows are scanned from top to bottom. In graphics mode, at the start of each line, the address counter is set to the address at the start of the previous line plus the address pitch, AP. In text mode, the address counter is set to the same start address, and the same character data is read, for each row in the character bitmap. However, a new row of the character generator output is used each time. Once all the rows in the character bitmap have been displayed, the address counter is set to the start address plus AP and the next line of text is displayed. Figure 28. Virtual and physical screen relationship A/P Character memory area Graphics memory area (XM,YM) (XM,0) (0,0) (X,Y) (0,YM) (XW,YM) 0800H 0000H Display memory window 07FFH 47FFH C/R Y X DISPLAY CONTROL FUNCTIONS |
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