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STM8S データシート(PDF) 356 Page - STMicroelectronics |
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STM8S データシート(HTML) 356 Page - STMicroelectronics |
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356 / 467 page  Universal asynchronous receiver transmitter (UART) RM0016 356/467 DocID14587 Rev 14 Figure 135. LIN synch field measurement UARTDIV is an unsigned integer, coded in the BRR1 and BRR2 registers as shown in Figure 119. If LASE bit = 1 then UARTDIV is automatically updated at the end of each LIN Synch Field. Three registers are used internally to manage the auto-update of the LIN divider (UARTDIV): • UARTDIV_NOM (nominal value written by software at UART_BRR1 and UART_BRR2 addresses) • UARTDIV_MEAS (results of the Field Synch measurement) • UARTDIV (used to generate the local baud rate) The control and interactions of these registers are explained in Figure 136 and Figure 137. They depend on the LDUM bit setting (LIN Divider Update Method) As explained in Figure 136 and Figure 137, UARTDIV can be updated by two concurrent actions: a transfer from UARTDIV_MEAS at the end of the LIN Sync Field and a transfer from UARTDIV_NOM due to a software write to BRR1. If both operations occur at the same time, the transfer from UARTDIV_NOM has priority. Figure 136. UARTDIV read / write operations when LDUM = 0 |
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