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HV7121B

CMOS IMAGE SENSOR With 8-bit ADC

Hyundai Micro Electronics 

Electronics Industries Co., Ltd.

System IC Division

(15) Low Reference Number Register(low_ref_no)

HV7121B

CMOS IMAGE SENSOR

With 8-bit ADC

High : (Address 57h default:00h, Read Only)

Low : (Address 58h, default:00h, Read Only)

Low Reference Number Registers indicates number of pixels in frame that have a value less then 5. A

reference level values of each pixel is compare with ‘ 5’ , and accumulated to these registers during read state.

This counter value called low_ref_no, consist of two bytes and it is read only registers. Real number of pixels

that have value less than 5 is the twice of these register value. If low_ref_no is big value, you must increase

data value of Reset Level Control Register. These registers are updated after every VSYNC signal.

(16) High Reference Number Register (high_ref_no)

High : (Address 59h, default:00h, Read Only)

Low : (Address 5Ah, default:00h, Read Only)

High Reference Number Registers indicates number of pixels in a frame that have a value great then 123.

Reference level values of each pixels is compared with ‘ 123’ , and accumulated to these registers during read

state. This counter value called high_ref_no, consist of two bytes and it is read only registers. Real number of

pixels that have value great than 123 is the twice of these register value. If high_ref_no is big value, you must

decrease data value of Reset Level Control Register. These registers are also updated after every VSYNC

signal.

This document is a general product description and is subject to change without notice. Hyundai Electronics does not assume any

responsibility for use of circuits described. NO patent licenses are implied.

DA41990615R_1.0

Division

20

1999 Hyundai System IC

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