26 LCD CONTROLLER (LCDC)
26-46
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
D25
SWINV: Software Video Invert Bit
Inverts the display.
1 (R/W): Invert
0 (R/W): Normal display (default)
When SWINV is set to 1, the display on the LCD panel is inverted (displayed in inverse video). When
SWINV is set to 0, normal display is maintained. Inverse operation is applied to the LCDC output, and
does not affect the display memory.
D24
BLANK: Display Blank Enable Bit
Clears the display (entire screen turned blank).
1 (R/W): Blank
0 (R/W): Normal display (default)
When BLANK is set to 0, data in the display memory is displayed on the LCD panel. When BLANK is
set to 1, all FPDAT signals are dropped low (when SWINV = 0) or high (when SWINV = 1) to clear the
display. This setting does not affect the display memory.
This function is effective for both STN and HR-TFT panels.
D[23:8] Reserved
D7
FRMRPT: Frame Repeat for EL Panel Bit
Selects whether to repeat the frame-rate modulation pattern (effective only for EL panels).
1 (R/W): Repeated
0 (R/W): Not repeated (default)
When FRMRPT is set to 1, the internal 19-bit frame counter is enabled and starts counting the number
of frames. Each time this counter overflows (0x40000
→
0), the frame-rate modulation pattern is re-
peated. When FRMRPT is set to 0, the counter is disabled and the frame-rate modulation pattern is not
repeated.
D[6:5]
Reserved
D4
LUTPASS: LUT Bypass Mode Select Bit
Selects whether the look-up table is bypassed.
1 (R/W): Bypassed (default)
0 (R/W): Used
When LUTPASS is set to 1, the look-up table is bypassed and the pixel data in the display memory rep-
resents the display data to be sent to the LCD panel.
When LUTPASS is set to 0, the look-up table is used to convert pixel data in the display memory into
LCD interface data. In color mode, DSTRAM must be switched to LUTRAM before the color look-up
tables can be used.
In 12-, 16-, and 24-bpp color mode, this bit must be set to 1 as the look-up table cannot be used.
D3
Reserved
D[2:0]
BPP[2:0]: Bit-Per-Pixel Select Bits
Selects the bpp mode.
10.4 Specification of Bpp Mode
Table 26.
BPP[2:0]
bpp mode
0x7
Reserved
0x6
24 bpp
0x5
16 bpp
0x4
12 bpp
0x3
8 bpp
0x2
4 bpp
0x1
2 bpp
0x0
1 bpp
(Default: 0x0)