MFC2000 datasheet(247/426 Pages) ETC

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Multifunctional Peripheral Controller 2000

MFC2000

100723A

Conexant

12-1

12. Printer and Scanner Stepper Motor Interface

12.1 Vertical Print Stepper Motor Interface

12.1.1 Vertical Print 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 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

step timer register if necessary for the step after the next step (See Figure 12-1).

Motor

Pattern

Control

Motor

Timer

STEPCLK

divider

Motor

External

Motor

Driver

The Vertical Printer Motor Control Block

motor

moving

clock

(MMCLK)

stepping

clock

(STEPCLK)

stepping pulse

(STEPPULSE)

vertical print stepping interrupt

(VPSTEPIRQ)

Internal Bus Interface

and VPM Logic Control

MFC2000

Chip

External

Circuit

VPM_PWRCTRL

Figure 12-1. Vertical Printer Motor Control Block Diagram

The printer motor control lines are the four pins PM[3:0]/GPO[3:0]. These pins are selected as printer motor

control lines when bit 0 in the GPIOconfig register is set to 0 (default), and are selected as GPO's when this bit is

set to 1. The printer pattern or GPO data is output on pins PM[3:0]/GPO[3:0] from bits [3:0] (VPMF[3:0]) of the

VPMPattern register.

When selected as GPO's, data written by CPU to the VPMPattern register is immediately output on the GPO pins

and output data are not changed unless CPU writes another new data to the VPMPattern register.

When selected as printer motor control lines, data is not allowed to be written to the VPMPattern register no

matter whether the motor stepping is disabled or enabled.

At the beginning of the motor moving process, CPU needs to write the stepping mode and the stepping direction

to the VPStepCtrl register, the initial vertical print motor pattern to the VPMPattern register, and the 1st step timer

value to the VPStepTimer register (used to define the time interval between enabling stepping and the 1st step).

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