STW8019 datasheet(31/55 Pages) STMICROELECTRONICS

31 / 55 page

STw8009/STw8019

Control registers

31/55

c_mult[3:0]: multiplying factor of C digital output (before D/A convertors) and of color part of

CVBS signal.

bcs_en_main: Brightness, Contrast and Saturation control by Registers 69 to 71 on 4:4:4

video input

0 = disable

(*) 1 = enable

To adjust the luminance intensity of the display video image, the following formula is used:

Yout = Yin + b –128

Yin is the 8-bit input luminance

Yout is the result of ‘Brightness’ operation (still on 8 bits)

This value is saturated at 235 (16) or 254 (1) according to register6 bit ‘maxdyn’,

b: brightness (unsigned value with center at 128, default 128)

C_mult&ttxs

Address:

0x0041

Type: R/W

content

c_mult3

c_mult2

c_mult1

c_mult0

xxx

bcs_en_

main

default

[0]

Table 13.

c_mult[3:0]: multiplying factor of C digital output

c_mult3

c_mult2

c_mult1

c_mult0

factor value (c_mult)

(*)

1.000000 (1.000000 Dec.)

1.000001 (1.015625 Dec.)

1.000010 (1.031250 Dec.)

1.000011 (1.046875 Dec.)

...

1.001111 (1.234375 Dec.)

Brightness

Address:

0x0045

Type: R/W

content

default

0000

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