26 LCD CONTROLLER (LCDC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
26-17
Example
VRAM start address: 0x10000000
Screen width:
320 pixels
LUT:
Bypassed
LCD characteristics: Data = 0
→
Low LCD brightness
Display image
Coordinates
(0, 0)
320 pixels
VRAM data
Address
0x1000 0000
0x1000 0050
0x1000 00a0
:
0xf9 0xbf ..........
0xe4 0x6f ..........
0xf9 0xbf ..........
: :
80 bytes / line
Note) Display may be inverted depending on the LCD panel used.
5.5.4 Example of VRAM Data in 2-bpp Mode
Figure 26.
4-bpp mode (16 colors or 16 gray levels)
In 4-bpp mode, each 4-bit data in the VRAM corresponds to one pixel. The 4-bit data represents the brightness (0
to 15) of the pixel when the look-up table is bypassed or an LUT entry number (0 to 15) when the look-up table
is used.
(1,0)
(0,0)
D3 D2 D1 D0
LCD
I/F
LCD
I/F
LUT
entries 0 to 15
(3,0)
(2,0)
VRAM
Display start address
Byte address offset
4 bit / 1 pixel
When LUT is bypassed
When LUT is used
FPDAT signals
FPDAT signals
LUT entry number
(x, y)
MSB
LSB
Brightness data
in the specified
entry
+0
+1
(5,0)
(4,0)
+2
(7,0)
(6,0)
+3
(9,0)
(8,0)
+4
(11,0)
(10,0)
+5
(13,0)
(12,0)
+6
(15,0)
(14,0)
+7
b[7:4] b[3:0]
5.5.5 VRAM Data Format in 4-bpp Mode
Figure 26.
Example
VRAM start address: 0x10000000
Screen width:
320 pixels
LUT:
Bypassed
LCD characteristics: Data = 0
→
Low LCD brightness
Display image
Coordinates
(0, 0)
320 pixels
VRAM data
Address
0x1000 0000
0x1000 00a0
0x1000 0140
:
0xfe 0xdc 0xba 0x98 .....
0x76 0x54 0x32 0x10 .....
0x89 0xab 0xcd 0xef .....
: : : :
160 bytes / line
Note) Display may be inverted depending on the LCD panel used.
5.5.6 Example of VRAM Data in 4-bpp Mode
Figure 26.