ADE3800SXT datasheet(49/138 Pages) STMICROELECTRONICS

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ADE3800

Measurement Window: The Min / Max value is found over a defined window as described in

Window Control.

Color Channels: A specific color channel (R/G/B) or all color channels (All) can be applied to the

Min / Max value.

Result: The output at the end of the measurement is two 8 bit numbers, the Minimum Pixel value

and the Maximum Pixel value.

4.9.8

Pixel Cumulative Distribution (PCD)

PCD function reports the total number of pixels greater than (or less than) a programmable

threshold.

To switch between pixels greater than or pixel less than the threshold, a control bit is provided in the

Mode register when requesting a measurement.

Measurement Window: The PCD value is calculated over a defined window as described in

Window Control.

Color Channels: A specific color channel (R/G/B) or all color channels (All) can be applied to the

PCD function.

Result: The output at the end of the measurement is a 24 bit number.

4.9.9

H Position Min / Max

Horizontal position measures the start and end of video data in inclks relative to the reference edge

of HSync.

Data horizontal start is defined as the number of inclks between the selected edge of HSync and the

“first data pixel”.

First data pixel definition is either:

1. First pixel > a programmable threshold value (normal)

2. First pixel with the absolute value (current pixel – previous pixel) is > a programmable threshold

value

Data horizontal end is defined as the number of inclks between reference edge of HSync and the

“last data pixel plus one”. The search for the last pixel ends at the end of a window.

Last data pixel plus one is either:

1. Pixel after the last pixel that is > a programmable threshold value (normal)

2. Last pixel with the absolute value (current pixel – previous pixel) is > a programmable threshold

value

To switch between the two threshold methods used in the first and last pixel, a control bit is provided

in the DMEAS_MODE_CTRL register when requesting a measurement.

The first and last pixels are measured for each line, and the earliest first and latest last for the

selected pixel area are reported out at the end of the measurement.

Measurement Window: The First / Last pixel on a line is found over a defined window as described

in Window Control.

Color Channels: All color channels are used to find the First / Last pixel on a line.

Result: The output at the end of the measurement is two 12 bit numbers, H position Min and H

position Max.

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