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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4635 датащи(PDF) 7 Page - STMicroelectronics |
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AN4635 датащи(HTML) 7 Page - STMicroelectronics |
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7 / 34 page  DocID027290 Rev 1 7/34 AN4635 Summary of features 33 2 Summary of features The LPUART has less features compared to the USART, however it is able to operate using less power and using the LSE clock more efficiently. The main features for the two peripherals are summarized in Table 2. The USART is also able to operate using LSE clock, the communication speed is limited to 4000 baud in case of oversampling by 8, 2000 baud when oversampling is by 16. When using the LPUART, only the 32.768 kHz LSE clock is required to allow UART communications up to 9600 baud with minimal energy consumption and very precise speed setting allowed by the external crystal. For higher speeds (for example the 57600 baud used for BT LE) the LPUART energy efficiency advantage drops, but still remains measurable around 5% (see Section 6.9: Higher communication speed). This document focuses on communication at 9600 baud, common to many applications: the efficiency advantage of LPUART is more pronounced when using wakeup from Stop at the 9600 baud speed setting. Table 2. Comparison of features Configuration LPUART USART LSE 9600 baud option + - Synchronous mode - + IrDA SIR ENDEC block - + Smartcard mode - + Auto baud rate detection - + Modbus communication - + LIN mode - + |
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