Epson Research and Development
Page 45
Vancouver Design Center
Programming Notes and Examples
S1D13503
Issue Date: 01/01/30
X18A-G-002-06
5.4 Split Screen
This section describes how to create a split screen for both single and dual LCD panels. For single panel displays, the
Screen 1 Display Line Count Registers are used. For dual panel displays, the Screen 2 Display Start Address Registers are
used.
Registers
AUX[0A] bits 7-0 Screen 1 Display Line Count Bits [9:0]
AUX[0B] bits 1-0 These bits are the eight LSB of a 10-bit value used to determine the number of lines displayed for screen 1.
The remaining lines will automatically display from the screen 2 display start address. The 10-bit value
programmed is the number of display lines -1.
This register is used to enable the split screen display feature (single panel only) where two different
images can be displayed at the same time on one display.
For example; AUX[0A] = 20h for a 320x240 display system. The display will display 20h+1 = 33 lines on
the upper part of the screen as dictated by the screen 1 display start address registers (AUX[06] and
AUX[07]), and 240 - 33 = 207 lines will be displayed on the lower part of the screen as dictated by the
screen 2 display start address registers (AUX[08] and AUX[09]).
Two different images can be displayed when using a dual panel configuration by changing the screen 2 dis-
play start address. However, by using this method screen 2 is limited to the lower half of the display.
This register is ignored in dual panel mode.
Note
See Section 4.2.2, “Display Start Address Registers” on page 37 for additional register descriptions.
5.4.1 Description
A split screen is generally considered as the presentation of two different images on the screen. Image 1 is shown on the
top half and image 2 is shown on the bottom half of the screen. The system is always in split screen mode, on a single panel
image 2 is displayed off screen; on a dual panel image 2 becomes the lower half of the panel.
AUX[0A] Screen 1 Display Line Count Register (LSB)
I/O address = 1010b, Read/Write.
Screen 1
Display
Line Count
Bit 7
Screen 1
Display
Line Count
Bit 6
Screen 1
Display
Line Count
Bit 5
Screen 1
Display
Line Count
Bit 4
Screen 1
Display
Line Count
Bit 3
Screen 1
Display
Line Count
Bit 2
Screen 1
Display
Line Count
Bit 1
Screen 1
Display
Line Count
Bit 0
AUX[0B] Screen 1 Display Line Count Register (MSB)
I/O address = 1011b, Read/Write.
n/a
n/a
n/a
n/a
n/a
n/a
Screen 1
Display
Line Count
Bit 9
Screen 1
Display
Line Count
Bit 8
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