Motorola M68HC08 manual Align State

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Software Design

5.5.4 Align State

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 Figure 5-9.

ENTER

RUN CONDITION (STOP_F = 0)

	CURRENT MEASUREMENT
	IS DONE
	CURRENT CONTROLLER
ALIGN TIME-OUT	(CMD_F = 1)
SCHEDULER	OVER-CURRENT
	DETECTION
	(CMD_F = 0)
ALIGN TIME-OUT EXPIRED
	IRRECOVERABLE OVER-CURRENT
	FAULT
EXIT	STATE

TIMER1 (TIM A CH1) INTERRUPT

CURRENT MEASUREMENT

ISR

CURRENT MEASUREMENT IS DONE (CMD_F = 1)

DONE

Figure 5-9. Align State

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

Designer Reference Manual		DRM028 — Rev 0
94	Software Design	MOTOROLA
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