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AN4635 Datasheet(PDF) 9 Page - STMicroelectronics |
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AN4635 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 34 page  DocID027290 Rev 1 9/34 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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