Epson S1D13503 Series Technical Manual page 111

Notes
When using a dual panel, the Screen 1 Display Line Count Register is ignored by the S1D13503.
Once the two Display Start Address Registers are programmed, the top panel will show the begin-
ning of image 1, and the bottom panel will show the beginning of image 2 (see Figure 5-6).
Each image can be scrolled or panned by appropriate programming of the respective Display Start
Address Registers. The following are some examples:
• To scroll image 1 up, the Screen 1 Start Address Register must point to the following scan line.
Screen 1 display start address
AUX[06h] = LSB of Screen 1 Display Start Address
AUX[07h] = MSB of Screen 1 Display Start Address
• To scroll image 2 down, the Screen 2 Start Address Register must point to the previous scan line.
Screen 2 display start address
AUX[08h] = LSB of Screen 2 Display Start Address
AUX[09h] = MSB of Screen 2 Display Start Address
• To pan image 1 to the right by a group of pixels, the Screen 1 Start Address Register must be
increased by 1.
AUX[06h] = LSB of Screen 1 Display Start Address
AUX[07h] = MSB of Screen 1 Display Start Address
See "Panning Right and Left" on page 38 for more information.
• To pan image 2 to the left by a group of pixels, the Screen 2 Start Address Register must be
decreased by 1.
AUX[08h] = LSB of Screen 2 Display Start Address
AUX[09h] = MSB of Screen 2 Display Start Address
See "Panning Right and Left" on page 38 for more information.
S18A-G-002-02
Scan Line 0
...
Scan Line 239
Scan Line 240
...
Scan Line 479
Screen 1 Display Line Count is ignored;
Image 1 always has half the total number of scan
lines (240 in this example).
Figure 5-6 640 × 480 Dual Panel for Split Screen
= Screen 1 display start address
= Screen 2 display start address
Screen 1 display start address
Screen 2 display start address
S1D13503 Programming Notes and Examples
Image 1
Image 2
Number of bytes per scan line
+ -------------------------------------------------------------------------------
Number of bytes per scan line
–
-------------------------------------------------------------------------------
= Screen 1 display start address
= Screen 2 display start address 1
2 bytes per word
2 bytes per word
+ 1
–
2-35