Examples - Epson S1D13505F00A Technical Manual

REG[13h] Screen 2 Display Start Address Register 0
Start Address Start Address Start Address
Bit 7 Bit 6
REG[14h] Screen 2 Display Start Address Register 1
Start Address Start Address Start Address
Bit 15 Bit 14
REG[15h] Screen 2 Display Start Address Register 2
n/a n/a
These three registers form the twenty bit offset to the first word in display buffer that will be shown
in the screen 2 portion of the display.
Screen 1 memory is always the first memory displayed at the top of the screen followed by screen 2
memory. However, the start address for the screen 2 image may in fact be lower in memory than that
of screen 1 (i.e. screen 2 could be coming from offset 0 in the display buffer while screen 1 was
coming from an offset located several thousand bytes into display buffer). While not particularly
useful, it is possible to set screen 1 and screen 2 to the same address.

Examples

Example 6
Display 380 scanlines of image 1 and 100 scanlines of image 2. Image 2 is located
immediately after image 1 in the display buffer. Assume a 640x480 display and a
color depth of 1 bpp.
1. The value for the line compare is not dependent on any other setting so we can set it immediately
(380 = 0×17C).
Write the line compare registers [0Fh] with 0x01 and register [0Eh] with 0×7C.
2. Screen 1 is coming from offset 0 in the display buffer. Although not necessary, ensure that the
screen 1 start address is set to zero.
Write 0×00 to registers [10h], [11h] and [12h].
3. Calculate the size of the screen 1 image (so we know where the screen 2 image is located). This
calculation must be performed on the virtual size (offset register). Since a virtual size was not
specified assume the virtual size to be the same as the physical size.
offset = pixels_per_line / pixels_per_word = 640 / 16 = 40 words per line
screen1_size = offset * lines = 40 * 480 = 19,200 words = 0×4B00 words
4. Set the screen 2 start address to the value we just calculated.
Write the screen 2 start address registers [15h], [14h] and [13h] with the values 0×00, 0×4B and
0×00 respectively.
S1D13505 PROGRAMMING NOTES
AND EXAMPLES (X23A-G-003-05)
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Start Address Start Address Start Address
Bit 5 Bit 4 Bit 3
Start Address Start Address Start Address
Bit 13 Bit 12 Bit 11
Start Address Start Address
n/a n/a
Bit 19
Figure 5-7 Screen 2 Display Start Address
EPSON
5: ADVANCED TECHNIQUES
Start Address Start Address
Bit 2 Bit 1 Bit 0
Start Address Start Address
Bit 10 Bit 9 Bit 8
Start Address Start Address
Bit 18 Bit 17 Bit 16
2-21