27 GRAPHICS ENGINE (GE)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
27-59
6.5 Source and Destination Data Types
Table 27.
TF_TYPE
GE Condition
USIL Condition
Source display data
Destination display data
0
(Byte to Byte)
1 bpp
LCD SPI 8-bit mode
or LCD parallel mode
P7 P6 P5 P4 P3 P2 P1 P0
P7 P6 P5 P4 P3 P2 P1 P0
2 bpp
P3 P2 P1 P0
P3 P2 P1 P0
4 bpp
P1 P0
P1 P0
8 bpp
P0
P0
0
(Byte to Byte)
8 bpp
*
LCD SPI 24-bit mode
or LCD parallel mode
P2 P1 P0
P0:
R7 R6 R5 R4 R3 R2 R1 R0
G7 G6 G5 G4 G3 G2 G1 G0
B7 B6 B5 B4 B3 B2 B1 B0
LCD SPI 18-bit mode
format 2/3
P2 P1 P0
P0:
R7 R6 R5 R4 R3 R2
G7 G6 G5 G4 G3 G2
B7 B6 B5 B4 B3 B2
16 bpp
LCD SPI 16-bit mode
or LCD parallel mode
P0:
R4 R3 R2 R1 R0
G5 G4 G3 G2 G1 G0
B4 B3 B2 B1 B0
P0:
R4 R3 R2 R1 R0
G5 G4 G3 G2 G1 G0
B4 B3 B2 B1 B0
LCD SPI 18-bit mode
format 0/1
P0:
R4 R3 R2 R1 R0
G5 G4 G3 G2 G1 G0
B4 B3 B2 B1 B0
P0:
R4 R3 R2 R1 R0 X
G5 G4 G3 G2 G1 G0
B4 B3 B2 B1 B0 X
1
(Pixel to Byte)
1 bpp
LCD SPI 8-bit mode
or LCD parallel mode
D0
D0 D0 D0 D0 D0 D0 D0 D0
2 bpp
D1 D0
D1 D0 D1 D0 D1 D0 D1 D0
4 bpp
D3 D2 D1 D0
D3 D2 D1 D0 D3 D2 D1 D0
8 bpp
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
16 bpp
R4 R3 R2 R1 R0
G5 G4 G3 G2 G1 G0
B4 B3 B2 B1 B0
R4 R3 R2
G5 G4 G3
B4 B3
*
In this mode, GE cannot draw anything, as RGB data is regarded as 3-pixel data not for 1 pixel. However, the
BLKCOPY command can be executed normally.
A 5-bpp LCD panel with SPI/parallel I/F can be used via USIL by setting TF_TYPE to 1 (Pixel to
Byte) and the color depth to 1 to 8 bpp.
D[15:5] Reserved
D4
SYNC_TYPE: LCDC Horizontal/Vertical Sync Type Select Bit
Selects either horizontal or vertical non-display period as the drawing period when the LCDC synchro-
nization function is enabled.
1 (R/W): Vertical non-display period
0 (R/W): Horizontal non-display period (default)
When the LCDC synchronization function is enabled in a drawing command, the GE starts drawing
objects/images (writing to the work area) in sync with the LCD non-display period start timings and
drawings are performed in the non-display periods selected using SYNC_TYPE. This makes it possible
to eliminate screen flicker. Note, however, that drawing time may exceed the non-display period if it is
complicated.
When LCDC synchronization function is disabled, the GE draws objects/images without a delay. In this
case, the SYNC_TYPE setting is ineffective.
D3
Reserved
D[2:0]
DISP_BPP[2:0]: Color Depth Bits
Selects the color depth (bpp mode) of image data to be written to the work area (VRAM).