LM9833 datasheet(11/42 Pages) NSC

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COMMAND REGISTER

Command Register

This register is used to start and end a scan.

It is also used to home the sensor in a

flatbed scanner or eject the image in a

sheetfed scanner. Note: Always make sure

the Command Register is in the idle state

(=0) before issuing a new command.

000

Idle - Stops motor (A, B, A, B = 0),

completes current line of data (if scanning).

Note: CCD/CIS clocks continue clocking.

001

High Speed Forward - Moves motor forward at a

speed determined by the Fast Feed Step Size

(registers 48 and 49).

010

High Speed Reverse - Moves motor backward at a

speed determined by the Fast Feed Step Size

(registers 48 and 49).

011

Start Scan - Resets the LM9833’s data pointers and

starts an image scan.

101

Programmed High Speed Forward - Moves motor

forward at a speed determined by the Fast Feed Step

Size (registers 48 and 49) for the number of lines

programmed in registers 4A and 4B.

110

Programmed High Speed Reverse - Moves motor

backward at a speed determined by the Fast Feed

Step Size (registers 48 and 49) for the number of lines

programmed in registers 4A and 4B.

Standby

When this bit is set the entire chip enters a

low power state.

Warning: A Standby command will stop

DRAM refresh.

Normal Operation.

Low Power Standby Mode.

Soft Reset

Write a 1 then a 0 to reset the LM9833’s

state machines.

Warning: A Reset will stop DRAM refresh.

Normal Operation.

Resets the LM9833. See section 10.2 Soft Reset for

instructions on using this bit.

MASTER CLOCK DIVIDER

MCLK Divider

This register sets the master clock frequency

for the entire scanner.

fMCLK = 48MHz/MCLK_Divider

fADC = fMCLK/8

0 00000÷1.0

0 00001÷1.5

0 00110÷4

a aaaaa÷ ((aaaaaa/2)+1)

1 11110÷32.0

1 11111÷32.5

Address

Function

Value

LM9833 Datasheet(PDF) 11 Page - National Semiconductor (TI)

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