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AN4635 Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte AN4635
Spiegazioni elettronici  Minimization of power consumption using LPUART in microcontrollers of the STM32L0 series
PDF  34 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4635 Scheda tecnica(HTML) 9 Page - STMicroelectronics

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AN4635
Operation modes
33
3.4.2
Combining DMA with direct access
The DMA channel is convenient for transmission of data, and it’s power efficient during
reception.
The downside is that in DMA mode the LPUART cannot take advantage of wakeup from
Stop mode. The reason is that after wakeup event the DMA has difficulty picking up on the
ongoing communication. This is a serious disadvantage for all applications that tend to
remain idle for long periods of time.
However the DMA can still be used for transmission and then reception can proceed with
blocking or interrupt approach. In communication systems where incoming messages are
coming in quick succession or predictable timing, the DMA based reception may also be an
efficient option.



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