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Viii-1-17
VIII
LCDC
Viii.1.5.4DisplayModes
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). Use BPP[2:0] (D[2:0]/0x301A60) to set a display (bpp) mode.
*BPP[2:0]:Bit-Per-PixelSelectBitsintheLCDCDisplayModeRegister(D[2:0]/0x301A60)
TableVIII.1.5.4.1SpecificationofDisplayModes
BPP1
1
0
1
0
Monochrome(CoLoR=0)
Reserved
4bpp,16graylevels
2bpp,4graylevels
1bpp,2graylevels
Color(CoLoR=1),stn
Reserved
16bpp,64Kcolors
12bpp,4Kcolors
8bpp,256colors
Reserved
Displaymode
BPP0
*
1
0
1
0
1
0
Color(CoLoR=1),tFt
Reserved
16bpp,64Kcolors
12bpp,4Kcolors
8bpp,256colors
4bpp,16colors
2bpp,4colors
1bpp,2colors
BPP2
1
0
(Default:0b000)
(1)1-bpp(2-gray-level/2-color)mode
One pixel is represented by 1 bit, displayed in two gray levels (STN) or two colors (TFT).
For monochrome LCD panels, 2-gray-level display can be obtained by assigning two gray levels from among
the 64 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 256K colors available can be set in advance using two en-
tries 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
Displaymemory
Pn=(An)
LCDpanel
Byte0
Byte1
(bit7)
(bit0)
LUT
FigureVIII.1.5.4.1DataFormatin1-bppMode
The look-up table can be bypassed in this mode, i.e., black-white mode, to reduce power consumption.
(2)2-bpp(4-gray-level/4-color)mode
One pixel is represented by 2 bits, displayed in four gray levels (STN) or four colors (TFT).
For monochrome LCD panels, 4-gray-level display can be obtained by assigning four gray levels from among
the 64 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 256K colors available can be set in advance using four en-
tries 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.
LUT
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)
Byte0
Byte1
Displaymemory
LCDpanel
(bit7)
(bit0)
FigureVIII.1.5.4.2DataFormatin2-bppMode
The look-up table can be bypassed in this mode to reduce power consumption.