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AN2281 Datasheet(PDF) 36 Page - STMicroelectronics

Part # AN2281
Description  Low cost self-synchronizing PMAC motor drive using ST7FLITE35
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2281 Datasheet(HTML) 36 Page - STMicroelectronics

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List of software functions and interrupt service routines
AN2281
36/38
Figure 23. LART_OVF1_IT_Routine block diagram
LART_OVF1_IT_Routine
Update Sine?
No
Yes
Integrate frequency to
compute the sine phase
Access look-up table using
phase as pointer
Scale according with sine
amplitude value
Negative sine
semiperiod?
Yes
No
Negate scaled value
Update DCRO register
Add 120° to the sine phase
Redo calculations
for DCR1 register
Add 120° to the sine phase
IRET
Redo calculations
for DCR2 register



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