ADE3700 datasheet(55/89 Pages) STMICROELECTRONICS

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ADE3700

Pattern Generator

When the programmed block size is such that the complete 8x8 grid is smaller than the total screen

area, the part of the screen area which is outside the 8x8 grid is forced to black.

2.13.2 Pattern Engine

In order to display two patterns simultaneously on the LCD screen, the Pattern Generator has two

pattern display engines. Each engine can display horizontal or vertical bicolor stripes, bicolor

checkers, color bars, gray scales or color scales. It is also possible to select the video stream from

the scaler as a pattern.

The pattern engine displays a bi-directional x-y symmetric pattern. Two 24-bit colors, C0 and C1,

are alternately displayed with a horizontal period of Width and vertical period of Height.

Programming a large Width and a small Height generates horizontal bars whereas the opposite will

generate vertical bars. Programming small numbers for Width and Height generates checker

patterns.

Each of the two patterns is also given X and Y offset attributes, so that it is possible to center the

pattern inside the grid blocks.

A gradient effect can be applied independently on each of the two patterns, to either or both

horizontal and vertical directions. The gradient effect takes two parameters: STEP and DELTA that

define a ramp.

2.13.3 Borders

The Border Generator adds a single pixel width border to the whole display area. Each of the four

sides of the display can be one of 8 independent colors.

Figure 7: Pattern Generator (Screen Split)

Table 19: PGEN Registers (Sheet 1 of 5)

Addr

Mode

Bits

Default

Description

PGEN_PGEN_ENAB

0x0600

[7:1]

Reserved

R/W

[0]

0x0

0 = disable PGEN block

1 = enable PGEN block

PGEN_GRID0

0x0601

R/W

[7:0]

0x0

Grid Row 0

PGEN_GRID1

0x0602

R/W

[7:0]

0x0

Grid Row 1

PGEN_GRID2

0x0603

R/W

[7:0]

0x0

Grid Row 2

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