S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 107
S1D13704
Manufacturer Part Number
S1D13704
Description
LCD Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13704.pdf
(492 pages)
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Vancouver Design Center
3 Memory Models
3.1 Display Buffer Location
3.1.1 1 Bit-Per-Pixel (2 Colors/Gray Shades)
Programming Notes and Examples
Issue Date: 01/02/12
Pixel 0
Bit 7
Figure 3-1: Pixel Storage for 1 Bpp (2 Colors/Gray Shades) in One Byte of Display Buffer
Pixel 1
Bit 6
The S1D13704 is capable of operating at four different color depths. The data format for
each color depth is packed pixel. S1D13704 packed pixel modes can range from one byte
containing eight adjacent pixels (1-bpp) to one byte containing just one pixel (8-bpp).
Packed pixel data memory may be envisioned as a stream of data. Pixels fill this stream
with one pixel packed in adjacent to the next. If a pixel requires four bits then it will be
located in the four most significant bits of a byte. The pixel to the immediate right on the
display will occupy the lower four bits of the same byte. The next two pixels to the
immediate right are located in the following byte, etc.
The S1D13704 contains 40 kilobytes of internal display memory. External support logic
must be employed to determine the starting address for this display memory in CPU address
space. On the S5U13704B00C PC platform evaluation boards the address is usually fixed
at D0000h.
1-bit pixels support two color/gray shades. In this memory format each byte of display
buffer contains eight adjacent pixels. Setting or resetting any pixel requires reading the
entire byte, masking out appropriate bits and, if necessary, setting bits to "1".
With color panels the two colors are derived by indexing into positions 0 and 1 of the Look-
Up Table. For monochrome panels the two gray shades are generated by indexing into the
first two elements of the green component of the Look-Up Table (LUT).
If the first two LUT elements are set to black (RGB = 0 0 0) and white (RGB = F F F) then
each "0" bit of display memory will display as a black pixel and each "1" bit will display as
a white pixel. The two LUT entries can be set to any desired colors, for instance red/green
or cyan/yellow.
Pixel 2
Bit 5
Pixel 3
Bit 4
Pixel 4
Bit 3
Pixel 5
Bit 2
Pixel 6
Bit 1
X26A-G-002-03
Pixel 7
Bit 0
S1D13704
Page 11
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