ADE3100 datasheet(72/88 Pages) STMICROELECTRONICS

72 / 88 page

Flicker Block

ADE3XXX

72/88

2.20

Flicker Block

The Flicker block computes correlations of the image data with potential inversion patterns of the

LCD which in turn allows the microcontroller to modify the polarity signal to cancel large area flicker.

This function is only useful in SmartPanel applications.

The incoming image is scored against 8 vertical Walsh functions. All patterns are considered to be

vertically, where horizontally the pixels are assumed to be alternating its RGB components.

The scores (0 to 7) are 32-bit unsigned quantities that reflect the correlation of the programmed

window area with the 8 Walsh functions.

The horizontal inversion of the LCD drivers must be programmed into FLICKER_CTRL0[2:0]. The

most common setting is +-+ or -+- (RGB).

A calculation is completed after the number of frames programmed into the FRAME_CNT_MAX reg

(0xCA03). With each frame, the calculation is performed on only a vertical strip. The width of that

strip (in pixels) is determined by the value programmed in the HBLOCK_SIZE reg (0xCA02) with the

following relation: strip width = 2 ^ (3 + HBLOCK_SIZE).

The FREE_RUN/FREEZE_SCORES bit (FLICKER_CTRL0[4]) enables the final calculation to be

captured easily by the microntroller. The internal flicker calculation continues to run -- only the

update of the I2C registers is blocked when this bit is set to prevent corrupution during readout.

Table 25: OSD Register

Addr

Mode

Bits

Default

Description

OSD_PORT

0C02

R/W

[7:0]

OSD access port

Table 26: Flicker Registers (Sheet 1 of 3)

Addr

Mode

Bits

Default

Description

FLK_CTRL

0x0CA1

R/W

[7:6]

0x0

Reserved

[5]

0x1

0: straight line uniform function

1: straight line hill function (normal)

R/W

[4]

0x0

0: free run

1: freeze scores

Set to a 1 when the microcontroller is

reading multibyte scores to prevent update

corruption.

R/W

[2:0]

0x25

Horizontal Subpixel Polarity Inversion

Pattern of LCD (even/odd pixels)

0x0: -R-G-B / +R+G+B

0x1: -R-G+B / +R+G-B

0x2: -R+G-B / +R-G+B (normal)

0x3: -R+G+B / +R-G-B

0x4: +R-G-B / -R+G+B

0x5: +R-G+B / -R+G-B (normal)

0x6: +R+G-B / -R-G+B

0x7: +R+G+B / -R-G-B

FLK_HBLOCK_SIZE

0x0CA2

R/W

[7:4]

Reserved

[3:0]

0x0

Width in pixels of the per frame scored area

= 2 ^ (3+ HBLOCK_SIZE)

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