GL842 datasheet(27/64 Pages) GENESYS

27 / 64 page

GL842 USB 2.0 2-in-1 Scanner Controller

Page 27

Offset 1Dh ……..……………………………………..…………..….…..………. Default value = 8’h04

CK4LOW

CK3LOW

CK1LOW TGSHLD4 TGSHLD3 TGSHLD2 TGSHLD1 TGSHLD0

R/W

7 CK4LOW

To set CCD clock4 are low under CCD TG.

6 CK3LOW

To set CCD clock3 are low under CCD TG.

5 CK1LOW

To set CCD clock1,2 are low under CCD TG.

4-0 TGSHLD[4:0] To set CCD TG shoulder width.

Note: You have to program the TGSHLD >= 2 (more than two).

Offset 1Eh ……..……………………………………..…………..….…..………. Default value = 8’h20

WDTIME3 WDTIME2 WDTIME1 WDTIME0 LINESEL3 LINESEL2 LINESEL1 LINESEL0

R/W

7-4 WDTIME[3:0] To set watch-dog time.

The unit is 30 seconds.

3-0 LINESEL[3:0] To set CIS Vertical DPI or dummy lines.

CIS : LINESEL = 0 full dpi.

= 1 1/2 dpi.

= 2 1/3 dpi.

…..

= 15 1/16 dpi.

CCD : LINESEL = 0 no dummy line.

= 1 1 dummy line.

= 2 2 dummy lines.

…..

= 15 15 dummy lines.

Note: CIS can be implemented dummy line by motor move mothod,not dummy

lines.

Offset 1Fh ……..……………………………………..…………..….…..…….…. Default value = 8’h00

SCANFED7 SCANFED6 SCANFED5 SCANFED4 SCANFED3 SCANFED2 SCANFED1 SCANFED0

R/W

7-0 SCANFED[7:0] Move to scanning position by table one under two table operation.

Note: Can’t be programmed to logic zero.

Offset 20h ……..……………………………………..…………..….…..…….…. Default value = 8’h00

BUFSEL7

BUFSEL6

BUFSEL5

BUFSEL4

BUFSEL3

BUFSEL2

BUFSEL1

BUFSEL0

R/W

7-0 BUFSEL[7:0]

To set buffer condition (unit = 4k word).

Scanner execute backward/forward moving whenever buffer full.

If MAXWD < buffer condition, then motor move forward to scan.

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