June 2014
Beginner to intermediate
208 pages
7h 14m
English
Content preview from Computer Interfacing
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Motor drives
clue as to how the waveforms to drive the motor can be
obtained. If a 4-stage register is constructed and two
successive stages are set (Q = 1) while the other two
stages are cleared, then clock pulses will circulate the
required pattern around the register. Naturally, it is pos-
sible to produce the same result by writing a machine
code routine that circulates two Is in this way, outputting
them to the PIA between shifts. The number of shifts
determine the angle turned through; the frequency of the
shifting determines motor speed.
Available stepper motor ICs
The SAA1027 stepper motor driver
This IC is designed to drive 4-phase
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