STW8009 datasheet(32/55 Pages) STMICROELECTRONICS

32 / 55 page

Control registers

STw8009/STw8019

32/55

Adjustment of the relative difference between high and low intensity luminance values of the

displayed image is made according to the following formula:

Yin is the 8-bit input luminance,

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

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

c: contrast (2’s complement value from -128 to 127, default 0)

To adjust the colour intensity of the displayed video image, the following formula is used:

Crin,Cbin 8-bit input chroma,

Crout, Cbout the result of ‘Saturation’ operation (still on 8 bits)

This value is saturated at 240 (16) or 254 (1) according to bit ‘maxdyn’ (Reg 6),

s: saturation value (unsigned value with centre at 128, default 128)

Contrast

Address:

0x0046

Type: R/W

content

default

0000

Saturation

Address:

0x0047

Type: R/W

content

default

0000

Yo ut

Yi n 128

–

() c 128

()

128

-------------------------------------------------

128

Cbout

sCbin

128

–

()

128

-----------------------------------

128

Cro ut

sCrin

128

–

()

128

----------------------------------

128

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