SPI Configuration register
| CFG_SPEC | SPI Configuration register
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| CPHA_R | Field CPHA reader - Clock Phase select.
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| CPHA_W | Field CPHA writer - Clock Phase select.
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| CPOL_R | Field CPOL reader - Clock Polarity select.
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| CPOL_W | Field CPOL writer - Clock Polarity select.
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| ENABLE_R | Field ENABLE reader - SPI enable.
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| ENABLE_W | Field ENABLE writer - SPI enable.
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| LOOP_R | Field LOOP reader - Loopback mode enable. Loopback mode applies only to Master mode, and connects transmit and receive data connected together to allow simple software testing.
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| LOOP_W | Field LOOP writer - Loopback mode enable. Loopback mode applies only to Master mode, and connects transmit and receive data connected together to allow simple software testing.
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| LSBF_R | Field LSBF reader - LSB First mode enable.
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| LSBF_W | Field LSBF writer - LSB First mode enable.
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| MASTER_R | Field MASTER reader - Master mode select.
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| MASTER_W | Field MASTER writer - Master mode select.
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| R | Register CFG reader
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| SPOL0_R | Field SPOL0 reader - SSEL0 Polarity select.
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| SPOL0_W | Field SPOL0 writer - SSEL0 Polarity select.
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| SPOL1_R | Field SPOL1 reader - SSEL1 Polarity select.
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| SPOL1_W | Field SPOL1 writer - SSEL1 Polarity select.
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| SPOL2_R | Field SPOL2 reader - SSEL2 Polarity select.
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| SPOL2_W | Field SPOL2 writer - SSEL2 Polarity select.
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| SPOL3_R | Field SPOL3 reader - SSEL3 Polarity select.
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| SPOL3_W | Field SPOL3 writer - SSEL3 Polarity select.
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| W | Register CFG writer
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| CPHA_A | Clock Phase select.
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| CPOL_A | Clock Polarity select.
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| ENABLE_A | SPI enable.
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| LOOP_A | Loopback mode enable. Loopback mode applies only to Master mode, and connects transmit and receive data connected together to allow simple software testing.
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| LSBF_A | LSB First mode enable.
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| MASTER_A | Master mode select.
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| SPOL0_A | SSEL0 Polarity select.
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| SPOL1_A | SSEL1 Polarity select.
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| SPOL2_A | SSEL2 Polarity select.
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| SPOL3_A | SSEL3 Polarity select.
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