STV2310 datasheet(28/112 Pages) STMICROELECTRONICS

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Functional Description

STV2310

28/112

mechanism measures the chroma signal during the video line in order to compute the correcting

scale factor.

4.10.2 Programming

To enable the CrCb overload mechanism, set the CRCBOVER_EN bit in the DDECCONTB register.

The automatic gain for the RGB is set in the DDECCONT35 register.

4.11

Analog YCrCb Mode

4.11.1 General Description

The STV2310 can be programmed in Analog YCrCb mode. This mode has specific input

connections:

● the Y analog input signal must be connected to the CVBS1_Y (or CVBS2_Y) pin

● the Cr and Cb analog input signals must be connected to the R_CR and B_CB input pins

(respectively).

A ±20 degree Tint Control mechanism is available to compensate for incorrect hue levels on the

input signals. When the Analog YCrCb mode is programmed, the various clamp circuits are

modified accordingly.

Note:

The Fast Blanking (FB) signal is not relevant in Analog YCrCb mode. This mode is a full-page

display mode.

4.11.2 Programming

The YCrCb Tint Angle Correction values are programmed in the TINTANGLE[4:0] bits in the

DDECCONT12 register. The tint angle is coded from -20° to +20° in steps of 1.33°. These bits are

coded in 2's complement. The default value is 0 (no correction).

Figure 17: RGB Capture and Mixing with Main Picture

R Clamp

G Clamp

B Clamp

Soft

Main Picture

(YCrCb)

A/D

Converter

Conversion

Matrix

4:2:2

Formatting

and

Processing

Mixer

8-bit

6-bit

Interpolator

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