ADE3800XT 查看數據表（PDF） - STMicroelectronics

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ADE3800XT

Analog LCD Display Engine for XGA and SXGA Resolutions with Embedded LVDS and RSDS Transmitters

STMicroelectronics 

Register Description by Block

ADE3800

4.11.2 Color Mask Sequencer

4.11.2.1 Bars and Groups

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:

● 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

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 0

Bar 1

Bar 2

Bar group

Bar 3

Bar 4

Bar 5

Bar 6

Bar 7

One group per colour

C0 and C1

Up to 8 bars per colour

4.11.2.2 Bar Width, Height and Offset Control

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:

last bar in C0:

proceed to 1st bar in C1

DISPLAY

AREA

next

bar

in

C0

group

Bar 0 Bar 1 Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3

C0 C0 C0 C0 C0 C0 C1 C1 C1 C1 part of bars

off screen:

Bar 1 Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3 Bar 0 not entirely

C0 C0 C0 C0 C0 C1 C1 C1 C1 C0 displayed

Bar 2 Bar 3 Bar 4 Bar 5 Bar 0 Bar 1 Bar 2 Bar 3 Bar 0 Bar 1

C0 C0 C0 C0 C1 C1 C1 C1 C0 C0

bar

C0

6

bar

C1

4

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.

Note: The offset value, for each direction, must be less than the corresponding bar size.

4.11.2.3 Color Masks

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:

● if either R G B bit is reset, the corresponding colour component is blocked

● if set, the colour component is not blocked

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:

● Number of bars in C0 = PGEN_P0_MODE[7:5] +1 = 6 (bars 0 to 5)

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