LCD Registers

Other registers that used to be documented on this page are now at GPU Registers.

Registers

NAME	PHYSICAL ADDRESS	PROCESS VIRTUAL ADDRESS	KERNEL VIRTUAL ADDRESS	WIDTH
Parallax barrier enable	0x10202000	0x1ED02000	0xFFFD6000	0x4
Parallax barrier PWM	0x10202004	0x1ED02004	0xFFFD6004	0x4
LCD status	0x10202008	0x1ED02008	0xFFFD6008	0x4
LCD clock disable	0x1020200C	0x1ED0200C	0xFFFD600C	0x4
?	0x10202010	0x1ED02010	0xFFFD6010	0x4
LCD reset	0x10202014	0x1ED02014	0xFFFD6014	0x4
Top Screen LCD Configuration	0x10202200	0x1ED02200	0xFFFD6200	0x600
Bottom Screen LCD Configuration	0x10202A00	0x1ED02A00	0xFFFD6A00	0x600
?	0x10203200	0x1ED03200	0xFFFD7200	0x40

On screen-init (error screen), Boot11 sets 0x10202004 to 0xA390A39.

LCD Configuration

Offset	Size	Description
0x00	0x4	Flags
0x04	0x4	Fill Color
0x10	0x10	ABL Area
0x20	0x4	GTH Ratio
0x24	0x4	Min GTH
0x28	0x4	MinMax
0x2C	0x4	ExMax
0x30	0x4	Inertia
0x38	0x4	MinRS
0x3C	0x4	MaxRS
0x40	0x4	Backlight Level
0x44	0x4	Backlight Interval
0x60	0x20	Dither
0x80	0x24	LutListRS
0xF0	0x0C	?
0x100	0x100	LCD calibration data, pulled from nand:/ro/sys/HWCAL0.dat offset 0x77C. N3DS only. This area on old3DS is zero-filled and not writable.
0x200	0x400	?

Flags

Bit	Description
0	ABL on
8	?
9	?

Bits 8 and 9 control dither.

Fill Color

Bit	Description
7-0	Red component intensity
15-8	Green component intensity
23-16	Blue component intensity
24	Enable

When the enable bit is set, the specified solid color is displayed on the LCD instead of the framebuffer.

ABL Area

Offset	Description
0x00	X begin
0x04	X end
0x08	Y begin
0x0C	Y end

The values refer to 90° clockwise rotated screens.

Backlight Level

Bit	Description
9-0	Backlight PWM duty on (0 = off)

Backlight Interval

Bit	Description
9-0	Backlight PWM Interval, minus 1
16	Enable LCD (0 = disabled, 1 = enabled).
17	RS on (?)
18	?

On old 2DS, disabling the top LCD does nothing, disabling the bottom LCD affects both screens. Setting bit 18 makes the screen darker.