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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 571 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 571 Page - Renesas Technology Corp |
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571 / 923 page  533 14.5 Notes on Use Sections 14.5.1 through 14.5.9 provide information for using the SCI. 14.5.1 TDR Write and TDRE Flags The TDRE bit in the serial status register (SSR) is a status flag indicating loading of transmit data from TDR into TSR. The SCI sets TDRE to 1 when it transfers data from TDR to TSR. Data can be written to TDR regardless of the TDRE bit status. If new data is written in TDR when TDRE is 0, however, the old data stored in TDR will be lost because the data has not yet been transferred to the TSR. Before writing transmit data to the TDR, be sure to check that TDRE is set to 1. 14.5.2 Simultaneous Multiple Receive Errors Table 14.13 indicates the state of the SSR status flags when multiple receive errors occur simultaneously. When an overrun error occurs, the RSR contents cannot be transferred to the RDR, so receive data is lost. Table 14.13 SSR Status Flags and Transfer of Receive Data SSR Status Flags Receive Data Transfer Receive Error Status RDRF ORER FER PER RSR → RDR Overrun error 1 1 0 0 X Framing error 0 0 1 0 O Parity error 0 0 0 1 O Overrun error + framing error 1 1 1 0 X Overrun error + parity error 1 1 0 1 X Framing error + parity error 0 0 1 1 O Overrun error + framing error + parity error 11 1 1 X Notes: O = Receive data is transferred from RSR to RDR. X = Receive data is not transferred from RSR to RDR. |
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