MFC2000 datasheet(253/426 Pages) ETC

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Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

12-7

The step enable bit in the SStepCtrl register only controls if the motor pattern is allowed to change to the next

one. The motor pattern in the SMPattern register always goes out. CPU has the responsibility to write value ‘00h’

to the SMPattern register or set the bit 5 of the SStepCtrl register to a proper value according to the external

motor power control circuit for not driving the scan motor. Bit 5 value of the SStepCtrl register directly goes out of

the MFC2000 chip through the GPIO[12]/SASCLK/SMPWRCTRL pin.

Caution:

The GPIO[12]/SASCLK/SMPWRCTRL pin can only be used as the

SMPWRCTRL pin when bit 9 of the GPIOConfig1 register is ‘0’ and bit 10 of the GPIOConfig1

The step time interval between two adjacent stepping pulses (for example, t1 and t2) is determined by the timer

value. The min. time difference between two adjacent stepping pulses (It is called the timer resolution, for

example,

∆ t = | t2-t1|.) is determined by the frequency of the stepping clock (See Figure 12-4).

time is controlled by

the step timer

STEPPULSE

(in the speed-up period)

Figure 12-4. Stepping Timing

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 12-4. Full Step/Single Phase Excitation

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

> CW rotation

Step

pattern 1

Step

pattern 2

Step

pattern 3

Step

pattern 4

Step

pattern 1

SM [0](phase A)

10001

SM [1](phase B)

01000

SM [2](phase C)

00100

SM [3](phase D)

00010

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

Table 12-5. Full Step/Two Phase Excitation

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

> CW rotation

Step

pattern 1

Step

pattern 2

Step

pattern 3

Step

pattern 4

Step

pattern 1

SM [0](phase A)

10011

SM [1](phase B)

11001

SM [2](phase C)

01100

SM [3](phase D)

00110

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

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