User`s manual

3: DISPLAY BUFFER
S1D13504 PROGRAMMING NOTES EPSON 2-7
AND EXAMPLES (S19A-G-002-06)
3.2.4 Memory Organization for Eight Bit-per-pixel (256 Colors)
One pixel is stored in one byte of display buffer as shown below:
As shown above, the 256 color pixel is divided into three parts: three bits for red, three bits for
green, and two bits for blue. The red bits represent an index into the red LUT, the green bits repre-
sent an index into the green LUT, and the blue bits represent an index into the blue LUT. Although
eight bit-per-pixel only makes sense for a color panel, this memory model can be set on a mono-
chrome panel, however only eight shades of gray will be visible.
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:
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:
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 Modula-
tor. 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.
Table 3-4 Pixel Storage for 8 bpp (256 Colors) in One Byte of Display Buffer
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Red Bit 2 Red Bit 1 Red Bit 0 Green Bit 2 Green Bit 1 Green Bit 0 Blue Bit 1 Blue Bit 0
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
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