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AT89C5132-ROTIL 数据表(PDF) 128 Page - ATMEL Corporation |
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AT89C5132-ROTIL 数据表(HTML) 128 Page - ATMEL Corporation |
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128 / 181 page  128 4173D–USB–02/06 AT89C5132 Figure 19-11. Slave SPI Polling Policy Flows 19.3.7 Slave Mode with Interrupt Policy Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt policy. The transfer format depends on the master controller. Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is effective when reading SPDAT. SPI Initialization Polling Policy Disable interrupt SPIE = 0 SPI Transfer Polling Policy Data Received? SPIF = 1? Select Slave Mode MSTR = 0 Select Format Program CPOL & CPHA Enable SPI SPEN = 1 Prepare Next Transfer Write Data in SPDAT Get Data Received Read SPDAT Prepare Transfer write data in SPDAT |
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