
S INGLE IC CMOS  COLOR AND B/W DIGIT AL CAMERAS
Table 16 I
2
C Registers 
March 4, 2000 
Version 1.0 
22 
Sub-
address 
(hex) 
00 
Register 
Default 
(hex) 
Read/ 
Write 
Descriptions 
GAIN 
00 
RW 
AGC gain control 
GC[7:6] – Unimplemented. 
GC[5:0] – The current gain setting. 
This register is updated automatically if AGC is enabled. The internal controller stores the 
optimal gain value in this register. The current value is stored in this register if AGC is not 
enabled. 
Blue gain control 
BLU[7] – “0” decrease gain, “1” increase gain. 
BLU[6:0] – blue channel gain balance value. 
Note: 
This function is not available on the OV6130 image sensor. 
Red gain control 
RED[7] – “0” decrease gain, “1” increase gain. 
RED[6:0] – red channel balance value. 
Note: 
This function is not available on the OV6130 image sensor. 
Color saturation control 
SAT[7:3] – Saturation adjustment. “F8h” is highest and “00h” is lowest. 
SAT[2:0] – Unimplemented. 
Note: 
This function is not available on the OV6130 image sensor. 
Reserved 
Contrast control 
CTR[7] – selects gain at the dark area. “0” – gain=0.5 and “1” – gain=1. 
CTR[6:4] – reserved. 
CTR[3:0] – Contrast adjustment. “FFh” is highest and “00h” is lowest. 
Brightness control 
BRT[7:0] – Brightness adjustment. “FFh” is highest and “00h” is lowest. 
Sharpness control 
SHP[7:4] – Coring adjustment. Range: 0~80mV with step 5mV. 
SHP[3:0] – Strength adjustment. Range: 0~8
×
 with step 0.5
×
. 
Reserved 
White balance background: Blue channel 
ABLU[7:6] – rsvd 
ABLU[5] – “0” decrease background blue component, “1”  increase background blue 
component 
ABLU[4:0] - White balance blue ratio adjustment 
Note: 
This function is not available on the OV6130 image sensor. 
White balance background: Red channel 
ARED[7:6] – rsvd 
ARED[5] – “0” decrease background red component, “1” increase background red 
component 
ARED[4:0] - White balance red ratio adjustment 
Note: 
This function is not available on the OV6130 image sensor.
Common control R 
COMR[7] – Analog signal 2x gain control bit. “1” - Additional 2x gain, “0” - normal. 
COMR[6:0] – Reserved. 
Common control S 
COMS[7:6] – Reserved 
COMS[5:4] – select the lowest signal used in automatic black level expanding (or 
automatic brightness). “00” – lowest, “11” – highest and image is brighter. 
COMS[3:2] – select highest luminance level to be available in AWB control. “00” –
01 
BLUE 
80 
RW 
02 
RED 
80 
RW 
03 
SAT 
80 
RW 
04 
05 
Rsvd 04 
CTR 
××
48 
– 
RW 
06 
BRT 
80 
RW 
07 
SHP 
C6 
RW 
08-0B 
0C 
Rsvd 08-0B 
ABLU 
××
20 
– 
RW 
0D 
ARED 
20 
RW 
0E 
COMR 
0D 
RW 
0F 
COMS 
05 
RW