Display Modes - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

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).
LDCOLOR
0
1
(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.
Display memory
(bit 7)
Byte 1 A8 A9 A10 A11 A12 A13 A14 A15
Byte 0
A0 A1 A2 A3 A4 A5 A6 A7
(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.
Display memory
(bit 7)
Byte 1
A4 B4 A5 B5 A6 B6 A7 B7
Byte 0 A0 B0 A1 B1 A2 B2 A3 B3
S1C33L03 FUNCTION PART
VII LCD CONTROLLER BLOCK: LCD CONTROLLER
Table 2.5 Specification of Display Modes
BPP1 BPP0
0 0 2 gray levels
1 4 gray levels
1 0 16 gray levels
1
0 0 2 colors
1 4 colors
1 0 16 colors
1 256 colors
(bit 0)
P0 P1 P2 P3 P4 P5 P6 P7 P8
Pn = (An)
Figure 2.4 Data Format in 1-bpp Mode
(bit 0)
P0 P1 P2 P3 P4 P5 P6 P7
Pn = (An, Bn)
Figure 2.5 Data Format in 2-bpp Mode
EPSON
Display mode
1 bit-per-pixel
2 bit-per-pixel
4 bit-per-pixel
Reserved
1 bit-per-pixel
2 bit-per-pixel
4 bit-per-pixel
8 bit-per-pixel
LCD panel
LCD panel
A-1
B-VII
LCDC
B-VII-2-9