MFC2000 datasheet(249/426 Pages) ETC

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Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

12-3

The change sequence of the phase pattern in the Motor Pattern Control Sub-block is as follows: after the CPU

gives the initial phase pattern (any column in the following tables), the phase pattern will automatically change to

the next one after getting the time-out pulse of the timer (the stepping pulse) according to the clockwise (CW) or

counterclockwise (CCW) rotation in the following tables.

Table 12-1. Full Step/Single Phase Excitation

-------------------------

> CW rotation

Step

pattern 1

Step

pattern 2

Step

pattern 3

Step

pattern 4

Step

pattern 1

VPM [0](phase A)

10001

VPM [1](phase B)

01000

VPM [2](phase C)

00100

VPM [3](phase D)

00010

<------------------------ CCW rotation

Table 12-2. Full Step/Two Phase Excitation

-------------------------

> CW rotation

Step

pattern 1

Step

pattern 2

Step

pattern 3

Step

pattern 4

Step

pattern 1

VPM [0](phase A)

10011

VPM [1](phase B)

11001

VPM [2](phase C)

01100

VPM [3](phase D)

00110

<------------------------ CCW rotation

Table 12-3. Half-Step Excitation

-------------------------

> CW rotation

Step

FP1

Step

HP2

Step

FP3

Step

HP4

Step

FP5

Step

HP6

Step

FP7

Step

HP8

VPM [0]

VPM [1]

VPM [2]

VPM [3]

<------------------------ CCW rotation

Note:

FPx: full step pattern and x: 1-4, HPx: half step pattern and x:1-4

Programmability:

•

The frequency of STEPCLK is programmable (around 1.25 MHz

39 KHz) if the ICLK (internal) frequency is

10 MHz.

•

The step timer value is programmable (around 1us

400ms) if the ICLK (internal) frequency is

10 MHz.

•

The Motor moving direction (clockwise or counterclockwise) and the stepping mode (full step or half step) is

programmable.

•

The motor phase pattern is programmable.

•

Control bits for clearing the stepping interrupt and enabling the stepping logic are included.

•

A control bit for the vertical print motor power on/off.

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