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VII LCD CONTROLLER BLOCK: LCD CONTROLLER
S1C33L03 FUNCTION PART EPSON B-VII-2-9
A-1
B-VII
LCDC
Display Modes
The number of gray levels in grayscale display and the number of colors in color display are determined by the
number of bits representing each pixel (bpp = bits per pixel). Write this bpp value to BPP[1:0] (D[7:6])/LCDC
mode register 1 (0x39FFE2) in order to set the display mode (number of gray levels/colors displayed).
Table 2.5 Specification of Display Modes
LDCOLOR BPP1 BPP0 Display mode
02 gray levels 1 bit-per-pixel0
14 gray levels 2 bit-per-pixel
016 gray levels 4 bit-per-pixel
0
1
1Reserved
02 colors 1 bit-per-pixel0
14 colors 2 bit-per-pixel
016 colors 4 bit-per-pixel
1
1
1256 colors 8 bit-per-pixel
(1) 1-bpp (2-gray-level/2-color) mode
One pixel is represented by 1 bit, displayed in two gray levels or two colors.
For monochrome LCD panels, 2-gray-level display can be obtained by assigning two gray levels from among
the 16 gray levels available, including black and white, to two entries in the green look-up table (described
later) (one each for bits = "0" and "1").
For color LCD panels, two colors from among the 4,096 colors available can be set in advance using two
entries for pixel data "0" and "1" in each of the red, green, and blue look-up tables.
Data for eight consecutive pixels is stored as one byte in the display memory.
A0 A1 A2 A3 A4 A5 A6 A7
A8 A9 A10 A11 A12 A13 A14 A15
P0 P1 P2 P3 P4 P5 P6 P7 P8
Display memory
Pn = (An)
LCD panel
Byte 0
Byte 1
(bit 7) (bit 0)
Figure 2.4 Data Format in 1-bpp Mode
(2) 2-bpp (4-gray-level/4-color) mode
One pixel is represented by 2 bits, displayed in four gray levels or four colors.
For monochrome LCD panels, 4-gray-level display can be obtained by assigning four gray levels from among
the 16 gray levels available, including black and white, to four entries in the green look-up table (one each for
bits = "00" to "11").
For color LCD panels, four colors from among the 4,096 colors available can be set in advance using four
entries for pixel data "00" to "11" in each of the red, green, and blue look-up tables.
Data for four consecutive pixels is stored as one byte in the display memory.
A0 B0 A1 B1 A2 B2 A3 B3
A4 B4 A5 B5 A6 B6 A7 B7
P0 P1 P2 P3 P4 P5 P6 P7
Pn = (An, Bn)
Byte 0
Byte 1
Display memory LCD panel
(bit 7) (bit 0)
Figure 2.5 Data Format in 2-bpp Mode