Color Liquid Crystal Display Controller LH79524/LH79525 User’s Guide
4-30 Version 1.0
Table 4-27. CTRL Fields
BIT NAME DESCRIPTION
31:17 /// Reserved Reading returns 0. Write the reset value.
16 WATERMARK
LCD DMA FIFO Watermark Level
1 = Requests data when either of the two DMA FIFOs have eight or more
empty locations.
0 = Requests data when either of the two DMA FIFOs have four or more
empty locations.
15:14 ///
Reserved Reading returns 0. Write the reset value.
13:12 VCI
LCD Vertical Compare Program to generate an interrupt at:
00 = start of vertical synchronization
01 = start of back porch
10 = start of active video
11 = start of front porch
11 PWR
LCD Power Enable This bit controls power to the LCD panel. For this
bit to be functional, the CONTROL:LCDEN bit must be programmed to 1.
If programmed to 0, LCD power is off regardless of the setting of the
PWR bit.
1 = LCD power ON
0 = LCD power OFF
10 BEPO
Big-Endian Pixel Ordering The BEPO bit selects between little and
big-endian pixel packing for 1, 2 and 4 bpp display modes. The BEPO bit
has no effect on 8, 12, or 16 bpp pixel formats.
1 = Big-endian pixel ordering within a byte
0 = Little-endian ordering within a byte
9 BEBO
Big-Endian Byte Ordering to the LCD
1 = Big-endian byte order
0 = Little-endian byte order
8BGR
RGB or BGR Format Selection
1 = Bits 14:10 and 4:0 swapped (blue and red swapped)
0 = Display data normal output
7 DUAL
Dual Panel STN LCD
1 = Select Dual Panel LCD Mode
0 = Select Single Panel LCD Mode
6MONO8L
Monochrome LCD LCD is Monochrome with an 8-bit interface. This bit
controls whether a monochrome STN LCD uses a 4 or an 8-bit parallel
interface. It should be programmed to 0 for all other types of displays.
1 = Mono LCD uses 8-bit interface
0 = Mono LCD uses 4-bit interface
5 TFT
TFT LCD
1 = LCD is TFT — do not use grayscaler
0 = LCD is an STN display — use grayscaler
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