Motorola M68HC08 - Manual (Page 97)

Software Design
State Diagram
DRM028 — Rev 0 Designer Reference Manual
MOTOROLA Software Design 97
Figure 5-10. Back-EMF Acquisition
PWM (RELOAD) INTERRUPT (PWM CENTER)
BEMF ZERO CROSSING
SENSING ISR
DONE
(ICR_F=1)
COMMUTATION ISR
TIMER2 (TIM A CH3) INTERRUPT
(PC_F=1)
CURRENT MEASUREMENT
ISR
TIMER1 (TIM A CH1) INTERRUPT
DONE SCHEDULER
FIRST COMMUTATION
SERVICE OF COMMUTATION
DONE
(CMD_F = 1)
SERVICE OF RECEIVED
BACK-EMF ZERO CROSSING
DONE
DONE
ERROR HANDLER
IRRECOVERABLE COMMUTATION ERROR
IRRECOVERABLE OVER-CURRENT
DONE
ENTER
EXIT
CURRENT MEASUREMENT
IS DONE
FEEDBACK
MEASUREMENTS
MEASUREMENTS
SECOND COMMUTATION
DONE
DONE
DONE
FAULT STATE
PHASE HAS BEEN
COMMUTATED (PC_F=1)
HANDLER
HANDLER
OVER-CURRENT
PWM DUTY CYCLE IS LEFT AT VALIE
FOUND BY THE CURRENT CONTROLLER
DURING THE ALIGN STATE
COMMUTATIONS ARE LOCKED TO
THE BACK-BMF FEEDBACK
(START_F = 0)
CURRENT MEASUREMENT
IS DONE
(CMD_F = 1)
RECEIVED THE
ZERO CROSSING EVENT
(ICR_F = 1)
PHASE HAS BEEN
COMMUTATED CURRENT MEASUREMENT
IS DONE
(CMD_F = 1)
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..