
15 LCD CONTROLLER
S1C38000 TECHNICAL MANUAL
EPSON
125
bit 7
Vertical Non-Display Period Status (Read Only)
This is a read-only status bit.
0
The LCD panel output is in a Vertical Display Period.
1
The LCD panel output is in a Vertical Non-Display Period.
bit 6
Memory Controller Power Save Status (Read Only)
This read-only status bit indicates the power save state of the LCDC memory controller.
0
The LCDC memory controller is powered up.
1
The LCDC memory controller is powered down.
bit 4
Power Save Mode Enable
0
The software initiated power save mode of the LCDC is disabled.
1
The software initiated power save mode of the LCDC is enabled.
At reset, this bit is set to 1.
bit 0
HR-TFT MOD Control Bit
0
The LGPO7 Pin is driven low.
1
The LGPO7 Pin is driven high.
At reset, this bit is set to 1.
15.6.4 Look-Up Table Registers
bits 31–24 LUT Write Address Bits [7:0]
This register forms a pointer into the Look-Up Table (LUT) which is used to write LUT
data stored in bits [23:18], bits [15:10], and bits [7:2] of this register. A write to the LUT
Write Address pointer also updates the LUT Read Address pointer in LCD[1Ch]. The
data is updated to the LUT only with the completion of a 32-bit write to this register.
Writes of sizes other than 32 bits are not supported. These bits are write-only and return
00h if read.
Note: The S1C38000 has three 256-position, 6-bit wide LUTs, one for each of red, green, and
blue (see Section 15.9, “Look-Up Table Architecture” on page 141).
Table 15-13 LCD Bit-Per-Pixel Selection
Bit-per-pixel Select
Bits [4:0]
Color Depth (bpp)
Maximum Number of Colors/Shades
Max. No. Of
Simultaneously
Displayed Colors/
Shades
Passive Panel
(Dithering On)
TFT Panel
00001
1 bpp
256K/64
2/2
00010
2 bpp
256K/64
4/4
00100
4 bpp
256K/64
16/16
01000
8 bpp
256K/64
256/64
10000
16 bpp
64K/64
Power Save Configuration Register
LCD[14h]
Default = 0000 0011h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
VNDP
Status
(RO)
Mem
Controller
PS
Status
(RO)
n/a
Power
Save
Enable
n/a
HR-TFT
MOD Ctrl
15
14
13
12
11
10
98
765
4
3210
Look-Up Table Write Register
LCD[18h]
Write Only
LUT Write Address
LUT Red Write Data
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
LUT Green Write Data
n/a
LUT Blue Write Data
n/a
15
14
13
12
11
10
9876543210