CS7620 datasheet(44/70 Pages) CIRRUS

44 / 70 page

CS7620

DS301PP2

4.26

Timing Control - Extra Lines of Exposure in Low Resolution Mode (LSBs)

Default = 00h; Read/Write (address 24h)

4.27

Timing Control - Vsync Mode, Lines of Exposure in Low Resolution Mode (MSBs)

Default = 01h; Read/Write (address 25h)

Bit Number

765432

Bit Name

n_extra7

n_extra6

n_extra5

n_extra4

n_extra3

n_extra2

n_extra1

n_extra0

Default

0000000

Bit

Mnemonic

Function

n_extra7

Extra Lines: This allows for increased exposure time while in low resolution

mode.

In low resolution mode, the CS7620 continuously outputs data on a frame by

frame basis; so it can drive a LCD panel in a video mode. In this mode the

CS7620 ignores the expose signal. The default expose time is equivalent to

262 line times (see registers 25h and 26h, n_int).

N_extra provides a way to increase the exposure time beyond the one which

is set by register n_int (25h and 26h). The value of n_extra corresponds to the

number of line times.

n_extra6

n_extra5

n_extra4

n_extra3

n_extra2

n_extra1

n_extra0

Bit Number

765432

Bit Name

Reserved

vsync_md

lowres_sen3

lowres_sen2

lowres_sen1

lowres_sen0

n_int8

Default

000001

Bit Mnemonic

Function

7:6

Reserved

vsync_md

Vertical Sync: Vsync_md, will switch the RD_OUT pin to output a vertical sync signal on this

pin when the vsync_md register is set to 1. The default is 0 which outputs the RD_OUT signal

(see Figures 21 and 22).

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