lm9832 National Semiconductor Corporation, lm9832 Datasheet - Page 11

• Manufacturer Part Number: lm9832
• Description: Lm9832 42-bit Color, 1200dpi Usb Image Scanner
• Manufacturer: National Semiconductor Corporation

LM9832 Register Listing
Address
COMMAND REGISTER
MASTER CLOCK DIVIDER
07
08
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.
Standby
When this bit is set the entire chip enters a
low power state.
Warning: A Standby command will stop
DRAM refresh.
Reset
Write a 1 then a 0 to reset the LM9832’s
state machines.
Warning: A Reset will stop DRAM refresh.
MCLK Divider
This register sets the master clock frequency
for the entire scanner.
f
f
MCLK
ADC
= f
= 48MHz/MCLK_Divider
MCLK
/8
Function
(Continued)
D
7
D
6
D
0
1
0 0 0 0 0 0 ÷1.0
0 0 0 0 0 1 ÷1.5
0 0 0 1 1 0 ÷4
a a a a a a ÷ ((aaaaaa/2)+1)
1 1 1 1 1 0 ÷32.0
1 1 1 1 1 1 ÷32.5
5
D
4
0
1
11
D
3
D
0 0 0
0 0 1
0 1 0
0 1 1
1 0 1
1 1 0
2
D
1
D
0
Idle - Stops motor (A, B, A, B = 0),
completes current line of data (if scanning).
Note: CCD/CIS clocks continue clocking.
High Speed Forward - Moves motor forward at a
speed determined by the Fast Feed Step Size
(registers 48 and 49).
High Speed Reverse - Moves motor backward at a
speed determined by the Fast Feed Step Size
(registers 48 and 49).
Start Scan - Resets the LM9832’s data pointers and
starts an image scan.
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.
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.
Normal Operation
Low Power Standby Mode
Normal Operation
Resets the LM9832
Value
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