LM9833 datasheet(17/42 Pages) NSC

17 / 42 page

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STEPPER MOTOR CONTROL SETTINGS

n (Line Skipping)

Part of the “n out of m” function, consisting of

registers 43, 44, and 54 (bits 3-7).

ttttttt

n lines saved in DRAM for every m lines (register 44)

scanned, function bypassed if register value = 0.

n (lines saved per m lines scanned) = 256 - t

t = 256 - n

If t = 0 then function is bypassed.

m (Line Skipping)

Part of the “n out of m” function, consisting of

registers 43, 44, and 54 (bits 3-7).

m mmmmmmm

n lines (register 43) saved in DRAM for every m lines

scanned. m = 1 to 255.

If m = 0 then function is bypassed.

Full/Microstepping

0 Full Step Mode

1 Microstepping Mode

Current Sensing Phases

= 0 for fullstepping

= 1 for microstepping

1 Phase - No microstepping, just kickstart/stop

functions

2 Phases - necessary for microstepping

Stepper Motor Phase A Polarity

Positive (A/B/A/B Output high = winding energized)

Negative (A/B/A/B output low = winding energized)

WARNING: When idle, this setting leaves the motor

energized for unipolar motors, and will destroy bipolar

motor drivers. Keep this bit set to a 0.

Stepper Motor Phase B Polarity

Positive (A/B/A/B Output high = winding energized)

Negative (A/B/A/B output low = winding energized)

WARNING: When idle, this setting leaves the motor

energized for unipolar motors, and will destroy bipolar

motor drivers. Keep this bit set to a 0.

A, B, A, and B stepper motor status

A, B, A, and B output pins in Tri-State

1A, B, A, and B output pins active

Swap A/A with B/B

(Reverses motor direction)

Default polarity

Reverse Polarity

Fullstep During FastFeed at Start of Scan

Traditional Operation

Fullstep during fastfeed at start of scan

Scanning Step Size - MSB

n nnnnnnnThe step size of one microstep while scanning, in

units of pixel periods (minimum 2)

Scanning Step Size - LSB

n nnnnnnn

Fast Feed Step Size - MSB

nnnnnnThe step size of one microstep while fast feeding, in

units of pixel periods (minimum 2)

Fast Feed Step Size - LSB

n nnnnnnn

Fullsteps to Skip at Start of Scan - MSB

nnnnnnnWhen scan starts, paper is fed forward n full steps (0 -

32767) at highest speed. For “zooming” in flatbeds

Fullsteps to Skip at Start of Scan - LSB

n nnnnnnn

Step Counter - MSB

nnnnnnCounts n (0-16383) full steps. See register 58, bit 5

for more information.

Step Counter - LSB

n nnnnnnn

Pause scanning, stop/reverse motor

n nnnnnnn

Pause scan when buffer is n*2 (16 x 256k) or

n*8 (16x1M) kbytes full

Resume scanning, start motor

n nnnnnnn

Resume scan when buffer is n*2 (16 x 256k) or

n*8 (16x1M) kbytes full

Full steps to reverse when buffer is full

n nnnnnnnn (0-255) full steps (0 = do not reverse)

Acceleration Profile (stopped)

n n

n (0,1, 2, or 8) full step time units pause while stopped

Acceleration Profile (25%)

n n

n (0,1, 2, or 8) full steps at 25% speed

Acceleration Profile (50%)

n n

n (0,1, 2, or 8) full steps at 50% speed

Default Phase Difference - High Byte

n n 18 bit word used to calculate when motor resumes

after reversing and stopping. 1 < n < 262143. 2 bits in

Default Phase Difference - Mid Byte

n nnnnnnn

Default Phase Difference - Low Byte

n nnnnnnn

Lines to Process After Pause/

Lines to Discard after Resume

nnn

n (0-7) lines. This only applies if the motor doesn’t

reverse (reverse steps = 0)

Line Skipping Phase

Part of the “n out of m” function, consisting of

registers 43, 44, and 54 (bits 3-7).

Red sensor data arrives before Green sensor

Blue sensor data arrives before Green sensor

Line Skipping Color Phase Delay

Part of the “n out of m” function, consisting of

registers 43, 44, and 54 (bits 3-7).

n n n n

n lines, n = 0-15

Address

Function

Value

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