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AT83SND1CXXX-ROTIL Scheda tecnica(PDF) 154 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTIL Scheda tecnica(HTML) 154 Page - ATMEL Corporation |
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154 / 212 page  154 4109J–8051–10/06 AT8xC51SND1C Figure 18-11. Slave SPI Polling Flows 18.3.7 Slave Mode with Interrupt Policy Figure 18-10 shows the initialization phase and the transfer phase flows using the interrupt. 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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