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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMP86FS49AIUG датащи(PDF) 172 Page - Toshiba Semiconductor |
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TMP86FS49AIUG датащи(HTML) 172 Page - Toshiba Semiconductor |
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172 / 296 page  Page 156 13. Asynchronous Serial interface (UART2 ) 13.9 Status Flag TMP86FS49AIUG Figure 13-7 Generation of Overrun Error Note:Receive operations are disabled until the overrun error flag UART2SR<OERR> is cleared. 13.9.4 Receive Data Buffer Full Loading the received data in RD2BUF sets receive data buffer full flag UART2SR<RBFL> to "1". The UART2SR<RBFL> is cleared to “0” when the RD2BUF is read after reading the UART2SR. Figure 13-8 Generation of Receive Data Buffer Full Note:If the overrun error flag UART2SR<OERR> is set during the period between reading the UART2SR and read- ing the RD2BUF, it cannot be cleared by only reading the RD2BUF. Therefore, after reading the RD2BUF, read the UART2SR again to check whether or not the overrun error flag which should have been cleared still remains set. 13.9.5 Transmit Data Buffer Empty When no data is in the transmit buffer TD2BUF, UART2SR<TBEP> is set to “1”, that is, when data in TD2BUF are transferred to the transmit shift register and data transmit starts, transmit data buffer empty flag UART2SR<TBEP> is set to “1”. The UART2SR<TBEP> is cleared to “0” when the TD2BUF is written after reading the UART2SR. Final bit Stop Shift register xxxx0* 1xxxx0 yyyy xxx0** RXD2 pin UART2SR<OERR> INTRXD2 interrupt After reading UART2SR then RD2BUF clears OERR. RD2BUF UART2SR<RBFL> Final bit Stop Shift register xxxx0* 1xxxx0 xxxx yyyy xxx0** RXD2 pin UART2SR<RBFL> INTRXD2 interrupt RD2BUF After reading UART2SR then RD2BUF clears RBFL. |
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