AK8850 Datasheet, PDF (83/99 Pages) Asahi Kasei Microsystems – NTSC Digital Video Decoder

ASAHI KASEI
[AK8850]
BRIGHTNESS CONTROL REGISTER ( R / W ) [ SUB ADDRESS 0x12 ]
This register controls the Brightness adjustment.
Default value ( 0x00 ) corresponds to un-adjusted condition.
Sub Address 0x12
Default Value : 0x00
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
BR7
BR6
BR5
BR4
BR3
BR2
BR1
BR0
Default Value
0
0
0
0
0
0
0
0
Brightness Control Register Definition
BIT Register Name
bit 0
BR0
~
~
Brightness Control bit
bit 7
BR7
R/W Definition
Brightness level is defined following formula
R/W
-286mV Sync signal (without setup)
1 [BR7:BR0]*100/255
-286mV Sync signal (with setup)
1 [BR7:BR0]*108/255
-300mV Sync signal (without setup)
1 [BR7:BR0]*102/255
-300mV Sync signal (with setup)
1 [BR7:BR0]*111/255
CONTRAST CONTROL REGISTER ( R / W ) [ SUB ADDRESS : 0x13 ]
This register controls the Contrast adjustment.
Default value ( 0x80 ) corresponds to un-adjusted condition.
Sub Address 0x13
bit 7
bit 6
CONT7
CONT6
1
0
bit 5
CONT5
0
bit 4
bit 3
CONT4
CONT3
Default Value
0
0
bit 2
CONT2
0
Default Value : 0x80
bit 1
bit 0
CONT1
CONT0
0
0
Contrast Control Register Definition
BIT Register Name
bit 0
CONT0
~
~
Contrast Control bit
bit 7
CONT7
R/W Definition
Contrast adjustment range is 0 to 2 by 1/256
R/W step.
Rev.0
83
2003/01