Motorola M68HC08 Reference Manual page 94

Software Design
5.5.4 Align State
Designer Reference Manual
94
Freescale Semiconductor, Inc.
In the align state the rotor position is stabilized by applying PWM signals
to only two motor phases (no commutation). When preset time-out
expires, then this state is finished. See
ENTER
ALIGN TIME-OUT
SCHEDULER
ALIGN TIME-OUT EXPIRED
EXIT
TIMER1 (TIM A CH1) INTERRUPT
CURRENT MEASUREMENT
ISR
Scheduler
The scheduler handles the state transitions in the align state. The
dc-bus current measurement is done in OC interrupt service routine,
in order to keep synchronization with PWM cycle. After measurement
is made, the scheduler allows calculation by the current controller and
Software Design
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Figure
RUN CONDITION
(STOP_F = 0)
CURRENT MEASUREMENT
IS DONE
(CMD_F = 1)
IRRECOVERABLE OVER-CURRENT
CURRENT MEASUREMENT
IS DONE (CMD_F = 1)
DONE
Figure 5-9. Align State
5-9.
CURRENT CONTROLLER
OVER-CURRENT
DETECTION
(CMD_F = 0)
FAULT
STATE
DRM028 — Rev 0
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