MFC2000 datasheet(251/426 Pages) ETC

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Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

12-5

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

Step Timer Register

(VPStepTimer)

01FF805B

(Not Used)

bit 13 of the

step timer

bit 12 of the

step timer

bit 11 of the

step timer

bit 10 of the

step timer

bit 9 of the

step timer

bit 8 of the

step timer

Rst. Value

xx000000b

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

Step Timer Register

(VPStepTimer)

01FF805A

bit 7 of the

step timer

bit 6 of the

step timer

bit 5 of the

step timer

bit 4 of the

step timer

bit 3 of the

step timer

bit 2 of the

step timer

bit 1 of the

step timer

bit 0 of the

step timer

Rst. Value

00h

Read Value

00h

•

The Time interval between two adjacent step pulses = (n+1)/STEPCLK, n (bit[13:0] of the step timer): from 0

to 16383

12.2 Scanner Stepper Motor Interface

12.2.1 Scanner Stepper Motor Control Description

The stepper motor can be controlled by this block to run at constant speed, increasing speed (acceleration), or

decreasing speed (deceleration).

The Motor Timer Sub-block contains two sets of loadable timers and timer registers. One is used for the step

control logic and the other is used for the delay control logic.

The step control logic is based on a loadable step timer and a step timer register. A pulse and interrupt are

generated when the step timer expires (timed-out) and at the same time, the content of the step timer register is

automatically loaded into the step timer. The pulse is used to change the phase pattern to the next one in the

Motor Pattern Control Sub-block and the interrupt is used to inform CPU to load the new step timer value to the

timer register if necessary for the step after the next step (See Figure 12-3).

Motor

Pattern

Control

Motor

Timer

STEPCLK

divider

Motor

External

Motor

Driver

The Scan Motor Control Block

motor

moving

clock

(MMCLK)

stepping

clock

(STEPCLK)

stepping pulse

(STEPPULSE)

vertical print stepping interrupt

(SSTEPIRQ)

Internal Bus Interface

and SM Logic Control

MFC2000

Chip

External

Circuit

SM_PWRCTRL

MSINT0

Figure 12-3. Scan Motor Control Diagram

MFC2000 Datasheet(PDF) 251 Page - List of Unclassifed Manufacturers

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