Motorola M68HC08 - Manual (Page 86)

Software Design
Designer Reference Manual DRM028 — Rev 0
86 Software Design MOTOROLA
Figure 5-5. Main Software Flowchart — Main Software Loop
STAND-BY
– CHECK START STOP SWITCH
– IF PC MASTER S/W MODE:
CHECK STARTCTRL FLAG
– IF RUN CONDITIONS:
SET STOP_F FLAG
ALIGNMENT STATE:
– TIME ALIGNMENT (TIMER3)
– APPLY VOLTAGE
– CURRENT CONTROL LOOP
– IF STOP OR FAULT CONDITION:
STOP MOTOR
EXIT RUNNING STATE
STARTING (ACQUISITION) STATE:
– PWM INCREMENT OF
– STARTINCROUTREGS8
– SET SPEED REGULATOR INTEGRAL
PORTION ACCORDING TO
CUR- RENT REGULATOR
– FIRST COMMUTATION STEP
– SECOND COMMUTATION STEP
– ACQUISITION STATE MOTOR
COMMUTATION LOOP
– IF I_CNTR_FOK SUCCESSIVE
CORRECT COMMUTATIONS:
EXIT STARTING (AQ.) STATE
– IF STOP OR FAULT CONDITION:
STOP MOTOR
EXIT RUNNING STATE
APPLICATION INITIALIZATION:
– CURRENT OFFSET CALIBRATION
– SYSTEM REGISTERS INITIALIZATION
– PWM INITIALIZATION
– TIMER 1 CURRENT SENSING TO PWM
SYNCHRONIZATION
– ADC MEASUREMENT INIT.
Stop_F Flag
DC-Bus over-voltage
YES
NO
YES
NO
RUNNING:
– SET TIMER PERIOD FOR SPEED
REGULATOR (VIRTUAL TIMER3)
– MOTOR COMMUTATION CONTROL
LOOP
– MOTOR SPEED CONTROL LOOP
– IF STOP OR FAULT CONDITION:
STOP MOTOR
EXIT RUNNING STATE
Stop_F Flag or Failure
Stop_F Flag or Failure
FAULT STATE:
– STOP MOTOR
– WAIT UNTIL FAULT CLEAR
– SET FAILURE.B.VOLTAGEFAILURE
Stop_F Flag or Failure
FAILURE
YES
NO
YES
NO
NO
YES
YES
NO
STATE:
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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