ade3800 STMicroelectronics, ade3800 Datasheet - Page 60

• Manufacturer Part Number: ade3800
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions With Embedded Lvds And Rsds Transmitters
• Manufacturer: STMicroelectronics

4.11.2 Color Mask Sequencer
4.11.2.1 Bars and Groups
4.11.2.2 Bar Width, Height and Offset Control
Note:
4.11.2.3 Color Masks
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Register Description by Block
next
bar
in
C0
group
A bar is the basic graphic element of the PGEN. A bar group is based on two independently
programmable 24 bit RGB colors named C0 and C1 and programmed into:
Each color C0 and C1 is assigned to 1 to 8 consecutive bars. The number of bars minus 1 is
programmable in PGEN_P0_MODE, bits [7:5] for C0 and [4:2] for C1:
Bar’s height and width are programmable, respectively in PGEN_P0_WDTH and PGEN_P0_HGHT
(16-bit wide).The actual number of displayed bars depends on the bar width, height and the panel
resolution. The bars are numbered in incremental fashion from left to right, top to bottom.
If the combined size of all bars in a group is smaller than the display area, each of the C0 and C1
bar groups is replicated across the display, as long as the bars still fit in the display area:
The height and width of a bar can range anywhere from 1 pixel (checkerboard) to full screen.
Additionally, an offset in both directions can be programmed respectively in registers
PGEN_P0_WDTH_X_OFFSET and PGEN_P0_HGHT_Y_OFFSET. It shifts the top left corner (1st
bar of C0 group) off the display area.
The offset value, for each direction, must be less than the corresponding bar size.
Each bar can filter any R G B component of its assigned C0 or C1 color, by means of 3 mask bits
per bar in registers PGEN_P0_SEQ_COL0_COL1 (bars 0 & 1) thru PGEN_P0_SEQ_COL6_COL7
(bars 6 & 7). The color is “ANDed” with the mask:
Example:
PGEN_COLOR_C0_B = PGEN_COLOR _C0_G = PGEN_COLOR _C0_R = FF sets C0 to white
PGEN_P0_MODE is set to AC:
●
●
●
●
●
Bar 0 Bar 1 Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3
C0
Bar 1 Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3 Bar 0
C0
Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3 Bar 0
C0
Bar 0
For C0: PGEN_P0_COLOR _R_C0, PGEN_P0_COLOR _G_C0, PGEN_P0_COLOR _B_C0
For C1: PGEN_P0_COLOR _R_C1, PGEN_P0_COLOR _G_C1, PGEN_P0_COLOR _B_C1
if either R G B bit is reset, the corresponding colour component is blocked
if set, the colour component is not blocked
Number of bars in C0 = PGEN_P0_MODE[7:5] +1 = 6 (bars 0 to 5)
C0
C0
C0
Bar 1
C0
C0
C0
Bar 2
C0
C0
C0
last bar in C0:
C0
C0
C1
Bar 3
Bar group
C0
C1
C1
Bar 4
C1
C1
C1
proceed to 1st bar in C1
Bar 5
C1
C1
C1
C1
C1
C0
Bar 6
C1
C0
Bar 1
C0
Bar 7
off screen:
part of bars
not entirely
displayed
One group per colour
C0 and C1
Up to 8 bars per colour
ADE3800
DISPLAY
bar
C0
bar
C1
AREA
6
4