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AT80SND1C-ROTIL Datasheet(PDF) 154 Page - ATMEL Corporation |
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AT80SND1C-ROTIL Datasheet(HTML) 154 Page - ATMEL Corporation |
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154 / 210 page  154 AT8xC51SND1C 4109E–8051–06/03 Slave Mode with Polling Policy Figure 121 shows the initialization phase and the transfer phase flows using the polling. The transfer format depends on the master controller. SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of reception” check). This provides the fastest effective transmission and is well adapted when communicat- ing at high speed with other Microcontrollers. However, the process may then be interrupted at any time by higher priority tasks. Figure 121. Slave SPI Polling Flows 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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