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AN1712 Datasheet(PDF) 10 Page - STMicroelectronics

Part # AN1712
Description  GENERATING A HIGH RESOLUTION SINEWAVE USING ST7 PWMART
PDF  14 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1712 Datasheet(HTML) 10 Page - STMicroelectronics

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GENERATING A HIGH RESOLUTION SINEWAVE USING ST7 PWMART
Figure 5. PWMART interrupt service routine
ART_Interrupt
Clears the overflow interrupt flag
counter = counter+1
return
Is counter >=
COUNTER?
no
yes
counter = 0
Upper half cycle
of sinewave?
Load the duty cycle register for up-
per half cycle of sinewave. This is
achieved by adding the current sam-
ple value into AVERAGE_AMP.
yes
no
Load the duty cycle register for lower
half cycle of sinewave. This is achieved
by subtracting the current sample value
from AVERAGE_AMP.
Index = Index+1
Is Index=
no_of_samples_half?
Index = 0 & change the po-
larity of sinewave cycle
yes
no



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