Motorola M68HC08 User Manual
Page 96
Software Design
Designer Reference Manual
DRM028 — Rev 0
96
Software Design
MOTOROLA
Second Commutation
The commutation time (T2) is calculated from the previous
commutation time and the start commutation period (Per_CmtStart).
This time is set to timer 2. Then, the new PWM multiplexer logic data
is readied for when the commutation interrupt performs the next
commutation.
The calculation of the commutation time is explained in
Starting — Commutation Time Calculation
Measurements Handler
As explained in
Scheduler
and
Over-Current Detection
, the dc-bus
current is scanned and over-current condition is evaluated. Where
there is an over-current, the control enters the fault state (see
Fault
State
). The voltage and the speed commands are scanned too. When
this state is finished, the values of dc-bus current, dc-bus voltage, and
speed command are updated.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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