H1A424M167 Datasheet, PDF (29/47 Pages) Hynix Semiconductor – Image Signal Processor for Hyundai CMOS Image Sensor

Hyundai Electronics Industries Co., Ltd.
H1A424M167
8.3. AUTO Register Map
( MCU Address Space A0h ~ B4h )
8.3.1. Function Enable Register[A0h]
Auto Function Enable Register[A0h]
[00h]
[7]
[6]
[5]
[4]
[3]
[1]
[0]
[ 7 ] Image Sensor ENB Control
[R/W]
1 : ENB enable,
0 : ENB disable
[ 6 ] AE Mode Control 1
[R/W]
Used with AE mode control 0 at bit 0
[ 5 ] Auto Histogram Equalization Enable
[R/W]
Automatically enables the histogram equalization function when larger
exposure time than exposure time limit value defined at the registers B0 ~ B2
is needed to achieve Y target brightness. This bit is not valid when manual
histogram equalization defined at register C3h is enabled.
1 : Auto Histogram Equalization ON
0 : Auto Histogram Equalization OFF
[ 4 ] Automatic Reset Level Control
[R/W]
Automatically controls the Reset Level of CMOS Image Sensor. Low
Reference Count Register and High Reference Count Register (Hyundai
CMOS Image Sensor Registers, Addressed 57h 58h 59h 5ah) denote the
current sampling condition. when the ARC function enable, ARC logic reads
these register values and compares with the threshold value within the Reset
Level Control Register(ISP Register Addressed AEh). If the low reference
count or high reference count is larger than the value of Reset Level Control
Register, ARC Logic considers Reset Level is not suitable for fine sampling,
and update the appropriate Reset Level Value in the Reset Level
Register(30h) of HYUNDAI CMOS Image Sensor.
1 : ARC on,
0 : ARC off
[ 3 ] Automatic G-color gain Control
[R/W]
AWB Logic control only the R, B color gain of CIS. So, for getting better color
balance and using large analog gain range, G color gain must be controlled. If
this function(AGC) is enabled, AGC Logic control appropriate G-color gain
level automatically. It may be disabled, when the analog gain range(Limited by
analog gain Top, Bottom Limit Register) is too small.
1 : AGC on,
0 : AGC off
1999 October 11
Page 29