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I can't understand about packing SPI

Question asked by bookevg on Sep 26, 2011
Latest reply on Sep 26, 2011 by Mitesh

From ADSP-214xx SHARC Processor Hardware Reference (p.15-18-p.15-19)

8-bit word. The SPI port sends out only the lower eight bits of the word written to the SPI buffer. For example, when receiving, the SPI port packs the 8-bit word to the lower 32 bits of the RXSPI buffer while the upper bits in the registers are zeros. This code works only if the MSBF bit is zero in both the transmitter and receiver, and the SPICLK frequency is less. If MSBF = 1 in the transmitter and receiver, and SPICLK has a lower frequency, the received words follow the order 0x12, 0x34, 0x56, 0x78.

I can't understand the last statement

If MSBF = 1 in the transmitter and receiver, and SPICLK has a lower frequency, the received words follow the order 0x12, 0x34, 0x56, 0x78.

What do it mean: the order 0x12, 0x34, 0x56, 0x78?

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