MC68HC705MC4 Datasheet, PDF (74/99 Pages) Motorola, Inc – Microcontrollers

MC68HC705MC4 Specification Rev. 1.5
although this will double the load on the processor. Depending upon the complexity of the
control algorithms adopted, and considering that the commutation must be performed with
software, care must be taken to maintain commutation delays to within acceptable limits.
The commutation would follow the sequence shown in Table 9-3: Brushless DC Motor
Commutation Sequence.
Table 9-3: Brushless DC Motor Commutation Sequence
Motor Phase
Phase A top
Phase A bottom
Phase B top
Phase B bottom
Phase C top
Phase C bottom
0
PWM
off
off
on
off
off
1
PWM
off
off
off
off
on
2
off
off
PWM
off
off
on
3
off
on
PWM
off
off
off
4
off
on
off
off
PWM
off
5
off
off
off
on
PWM
off
Section 9: Pulse Width Modulator
MOTOROLA
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