ADE3700 datasheet(68/89 Pages) STMICROELECTRONICS

68 / 89 page

Flicker

ADE3700

68/89

2.16

Flicker

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 areas of

flicker. This function is only useful in SmartPanel applications.

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

vertically, while horizontally the pixels are assumed to be alternating 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

that strip (in pixels) is determined by the value programmed in the HBLOCK_SIZE register

(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 MCU. The internal flicker calculation continues to run -- only the update of the I2C

registers is blocked when this bit is set to prevent corruption during readout.

0 to 14

[7:3]

Reserved

[2]

MSB of background color for the row

[1]

double high enable for the row

[0]

double wide enable for the row

0 to 14

0 to 29

[7:5]

3 LSBs of background color for 1bpp chars

no function for 4bpp color chars

[4]

blink enable

[3:0]

foreground color for 1bpp chars

for 4bpp color chars

[3:2]: Reserved

[1]: flip vertical

[0]: flip horizontal

Table 23: OSD Register

Addr

Mode

Bits

Default

(hex)

Description

OSD_PORT

0x0C02

R/W

[7:0]

OSD Access Port

Table 22: OSD Attribute Map Definition (Sheet 4 of 4)

Row

Column

Bits

Description

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