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STM8S 데이터시트(PDF) 357 Page - STMicroelectronics

부품명 STM8S
상세설명  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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STM8S 데이터시트(HTML) 357 Page - STMicroelectronics

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RM0016
Universal asynchronous receiver transmitter (UART)
377
Figure 137. UARTDIV read / write operations when LDUM = 1
Deviation error on the synch field
The deviation error is checked by comparing the current baud rate (relative to the slave
oscillator) with the received LIN Synch Field (relative to the master oscillator). Two checks
are performed in parallel.
The first check is based on a measurement between the first falling edge and the last falling
edge of the Synch Field.
•
If D1 > 14.84% LHE is set
•
If D1< 14.06% LHE is not set
•
If 14.06% < D1 < 14.84% LHE can be either set or reset depending on the dephasing
between the signal on UART_RX pin and the fMASTER clock
The second check is based on a measurement of time between each falling edge of the
Synch Field
•
If D2 > 18.75% LHE is set
•
If D2 < 15.62% LHE is not set
•
If 15.62% < D2 < 18.75% LHE can be either set or reset depending on dephasing
between the signal on UART_RX pin and the fMASTER clock
Note that the UART does not need to check if the next edge occurs slower than expected.
This is covered by the check for deviation error on the full synch byte.



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