Simultaneous Display Considerations - Epson S1D13506 Technical Manual

Page 60

9.5 Simultaneous Display Considerations

S1D13506
X25B-G-003-04
Program the LCD Display Start Address Registers. REG[044h] is set to 04h,
REG[043h] is set to AFh, and REG[042h] is set to FFh.
3. Set SwivelView Bit 1 by setting bit 4 of REG[040h]
4. The display will now show the previous image rotated by 180 degrees. Offset zero
into display memory will correspond to the lower right corner of the display.
5. Draw any new desired image. The drawing software can be completely unaware of the
display being rotated.
Although only the LCD panel image can be rotated, it is possible to simultaneously display
an independent image on the CRT or TV display. In this case, the programmer should be
aware of the following:
• As the LCD display buffer must start at offset 0 when a rotated display is required, the
CRT display buffer must be located after the LCD display buffer.
• When modifying the CRT display buffer, SwivelView Enable Bit 0 must be cleared and
then restored when finished. The following demonstrates this principle.
1. Save SwivelView Bit 0
2. Clear SwivelView Bit 0
3. Draw the CRT/TV image
4. Restore the saved SwivelView Bit 0.
Epson Research and Development
Vancouver Design Center
Programming Notes and Examples
Issue Date: 02/03/21