AN1914 Freescale Semiconductor / Motorola, AN1914 Datasheet - Page 35

• Manufacturer Part Number: AN1914
• Description: 3-Phase BLDC Motor Control with Sensorless Back EMF Zero Crossing Detection Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

7.2 Data Flow
The control algorithm obtains values from the user interface and sensors, processes them and generates
3-phase PWM signals for motor control as can be seen on the data flow analysis shown in
Up Button ISR:
increment
Omega Required Mechanical
ADC Low Limit ISR:
set Undervoltage Fault
set Overheating Fault
Emergency Stop
Interrupt
ADC Low Limit
Interrupt
Up Button
DSP56F80x MC PWM Module in Motor Control Applications
RTI
RTI
Figure 7-2. Main Software Flow Chart - Part 2
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PWM Fault ISR:
set Overcurrent Fault
set Overvoltage Fault
Emergency Stop
Interrupt
PWM A Fault
RTI
Down Button ISR:
decrement
Omega Required Mechanical
ADC High Limit ISR:
set Overvoltage Fault
set Overcurrent Fault
Emergency Stop
Interrupt
ADC High Limit
Interrupt
Down Button
RTI
RTI
Figure
SW Design
7-3.
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