W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 86

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

VA Stream Brightness/Contrast/Hue/Saturation Adj. Register (VAYCADJ)
Port address: 0x00000150
Bits 0-3
Bits 4-7
Bits 8-15
Bits 16-19
Bit 20
Bits 21-31
W90221X version 0.6
16
24
0
8
Saturation [0:3]
17
25
1
9
Reserved
Reserved
VA contrast value
A 4-bit contrast adjustment value allows adjustments in contrast from
1/8 to 15/8, in increments of 1/8. Bit 4 specifies the integral part and
bits 5-7 specify the decimal part of this value. Contrast adjustment is
implemented by multiplying the Y data by this constant.
VA brightness value
An 8-bit 2’ -complement value allows adjustments in brightness from -
128 to +127, in increments of 1. The brightness adjustment is
implemented by adding or subtracting this constant to/from the Y
data.
VA saturation value
A 4-bit saturation adjustment value allows adjustments in saturation
from 1/8 to 15/8, in increments of 1/8. Bit 16 specifies the integral part
and bits 17-19 specify the decimal part of this value. Saturation
adjustment is implemented by multiplying both Cb and Cr by this
constant.
Reserved
VA hue value
An 11-bit hue adjustment value allows adjustments in hue from 0
degree to 360 degree, in increments of 0.176 degree. Hue adjustment
is implemented by
Cb1 = Cb cosA + Cr sinA
Cr1 = Cr cosA - Cb sinA
10
18
26
2
Access type: read/write
Brightness [0:7]
11
19
27
3
Hue [3:10]
Reserved
12
20
28
4
13
21
29
Contrast [0:3]
5
Hue [0:2]
14
22
30
6
Default: 0x---
15
23
31
7
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