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AT83SND1CXXX-ROTIL 数据表(PDF) 151 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTIL 数据表(HTML) 151 Page - ATMEL Corporation |
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151 / 212 page  151 4109J–8051–10/06 AT8xC51SND1C 18.3.2 Slave Configuration The SPI operates in slave mode when the MSTR bit in SPCON is cleared and data has been loaded is SPDAT. 18.3.3 Data Exchange There are 2 possible methods to exchange data in master and slave modes: • polling • interrupts 18.3.4 Master Mode with Polling Policy Figure 18-9 shows the initialization phase and the transfer phase flows using the polling method. Using this flow prevents any overrun error occurrence. The bit rate is selected according to Table 121. The transfer format depends on the slave peripheral. SS may be deasserted between transfers depending also on the slave peripheral. SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of transfer” check). This polling method provides the fastest effective transmission and is well adapted when com- municating at high speed with other microcontrollers. However, the procedure may then be interrupted at any time by higher priority tasks. |
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