SED1354 Datasheet, PDF (154/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Page 14
Epson Research and Development
Vancouver Design Center
3.2.5 Memory Organization for 15 Bit-per-pixel (32768 Colors)
One pixel is stored in two bytes of display buffer as shown below:
Table 3-5: Pixel Storage for 15 bpp (32768 Colors) in Two Bytes of Display Buffer
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Reserved
Red Bit 4
Red Bit 3
Red Bit 2
Red Bit 1
Red Bit 0
Green Bit 4 Green Bit 3
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Green Bit 2 Green Bit 1 Green Bit 0 Blue Bit 4
Blue Bit 3
Blue Bit 2
Blue Bit 1
Blue Bit 0
As shown above, the 32768 color pixel is divided into four parts: five bits for red, five bits for green,
and five bits for blue and one reserved bit. The output bypasses the LUT and goes directly into the
Frame Rate Modulator. Although 15 bit-per-pixel only make sense for a color panel, this memory
model can be set on a monochrome panel, however only 16 shades of gray will be visible.
3.2.6 Memory Organization for 16 Bit-per-pixel (65536 Colors)
One pixel is stored in two bytes of display buffer as shown below:
Table 3-6: Pixel Storage for 16 bpp (65536 Colors) in Two Bytes of Display Buffer
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Red Bit 4
Red Bit 3
Red Bit 2
Red Bit 1
Red Bit 0
Green Bit 5 Green Bit 4 Green Bit 3
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Green Bit 2 Green Bit 1 Green Bit 0 Blue Bit 4
Blue Bit 3
Blue Bit 2
Blue Bit 1
Blue Bit 0
As shown above, the 65536 color pixel is divided into three parts: five bits for red, six bits for green,
and five bits for blue. The output bypasses the LUT and goes directly into the Frame Rate Modulator.
Although 16 bit-per-pixel only make sense for a color panel, this memory model can be set on a
monochrome panel, however only 16 shades of gray will be visible.
SED1354
X19A-G-002-06
Programming Notes and Examples
Issue Date: 98/10/28