26 LCD CONTROLLER (LCDC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
26-25
4-bpp mode (CSTN panel, LUT bypassed)
R brightness of the FPDAT signal
G brightness of the FPDAT signal
B brightness of the FPDAT signal
D0
4-bpp pixel data
D1
D2
D3
FPDAT[7:4] (4-bit passive panel)
FPDAT[7:0] (8-bit passive panel)
5.6.10 FPDAT Signals in LUT Bypass Mode (CSTN panel, 4-bpp mode)
Figure 26.
8-bpp mode (CSTN panel, LUT bypassed)
B brightness of the FPDAT signal
G brightness of the FPDAT signal
R brightness of the FPDAT signal
B0
8-bpp pixel data
B1
G0
G1
G2
R0
R1
R2
FPDAT[7:4] (4-bit passive panel)
FPDAT[7:0] (8-bit passive panel)
5.6.11 FPDAT Signals in LUT Bypass Mode (CSTN panel, 8-bpp mode)
Figure 26.
12-bpp mode (CSTN panel, LUT bypassed)
B brightness of the FPDAT signal
G brightness of the FPDAT signal
R brightness of the FPDAT signal
B0
12-bpp pixel data
B1
G0
G1
G2
R0
R1
R2
B2
B3
G3
R3
FPDAT[7:4] (4-bit passive panel)
FPDAT[7:0] (8-bit passive panel)
5.6.12 FPDAT Signals in LUT Bypass Mode (CSTN panel, 12-bpp mode)
Figure 26.
16-bpp mode (CSTN panel, LUT bypassed)
B brightness of the FPDAT signal
G brightness of the FPDAT signal
R brightness of the FPDAT signal
B0
16-bpp pixel data
B1
G0
G1
G2
R0
R1
R2
B2
B3
B4
G3
G4
G5
R3
R4
FPDAT[7:4] (4-bit passive panel)
FPDAT[7:0] (8-bit passive panel)
5.6.13 FPDAT Signals in LUT Bypass Mode (CSTN panel, 16-bpp mode)
Figure 26.
LUT bypass mode for MSTN panel
When an MSTN panel is used, LUT bypass mode is effective if the conditions shown below are all met.
• The LUT bypass function is enabled (LUTPASS/LCDC_DISPMOD register = 1).
• Monochrome mode is selected (COLOR/LCDC_DISPMOD register = 0).
• 1, 2, or 4-bpp mode is selected (BPP[2:0]/LCDC_DISPMOD register = 0x0 to 0x2).
In LUT bypass mode, pixel data in the VRAM specify a gray level to generate the FPDAT signals.
The following shows the relationship between pixel data and FPDAT signals in each bpp mode:
Note: An FPDAT signal is assigned to a pixel and 4 or 8 pixel data are sent to the MSTN panel at the
same time. MSTN panels turn the pixels on and off periodically to generate gray levels. The FP-
DAT signals do not represent gray levels directly in contrast to TFT panels.
1-bpp mode (MSTN panel, LUT bypassed)
D0
1-bpp pixel data
Brightness of the FPDAT signal
5.6.14 FPDAT Signals in LUT Bypass Mode (MSTN panel, 1-bpp mode)
Figure 26.
2-bpp mode (MSTN panel, LUT bypassed)
D0
2-bpp pixel data
D1
Brightness of the FPDAT signal
5.6.15 FPDAT Signals in LUT Bypass Mode (MSTN panel, 2-bpp mode)
Figure 26.