OV5017

8

Version 1.6

October 20, 1997

Confidential Preliminary Product Specification

EXCTL

AUTO

EXCTL[7]

Enables auto exposure. To select auto exposure mode, set this bit. To

select manual exposure mode, clear this bit.

EX

EXCTL[6:0]

Sets the exposure time, where 7fh is the 1/50s, and 00h is the 1/

(50*128*2)s. This register is used in manual exposure mode only.

After updates are made to this register, it takes two frames for the

chip to become stable.

GCTL

GN

GCTL[2:0]

Selects the post amplifier gain, where 111 is the 18dB gain and 000 is

the 0dB in a linear relationship. This register is used in manual expo-

sure mode only. After updates are made to this register, it takes two

frames for the chip to become stable.

FRCTL

FDIV

FRCTL[5:0]

Divides the frame rate by 1 to 64 in steps of 1 by using this formula:

After updates are made to this register, it takes two frames for the

chip to become stable.

MCTL

GAMA

MCTL[7]

Set this bit to select gamma = 0.45, and clear this bit for gamma = 1.

MIR

MCTL[6]

Set this bit to select mirror image.

NSR

MCTL[5]

Set this bit to turn on indoor mode, and clear for outdoor mode.

BKL

MCTL[4]

Set this bit to turn on backlight compensation.

FZEX

MCTL[3]

Set this bit to freeze the exposure setting. This works in auto expo-

sure mode; it has no effect in manual exposure mode.

PCKS

MCTL[2]

Clear this bit to output continuous pixel clock to PCLK; set to output

pixel clock only during the valid pixel window

PCKI

MCTL[1]

Set this bit to inverse the polarity of

BPSHP

MCTL[0]

Set this bit to disable sharpness function.

HWCTL/

VWCTL

HWS

HWCTL[7:4]

Selects the start of the horizontal window.

HWE

HWCTL[3:0]

Selects the end of the horizontal window.

VWS

VWCTL[7:4]

Selects the start of the vertical window.

VWE

VWCTL[3:0]

Selects the end of the vertical window.

Table 3. Bit descriptions (Continued)

Register

Name

Bit name

Range

Function