Texas Instruments TRF7970A Manual page 39

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DATA_CLK
MOSI
MISO
Slave
Select
6.10.5.1 Serial Interface Mode With Slave Select (SS)
The serial interface is in reset while the Slave Select signal is high. Serial data in (MOSI) changes on the
rising edge, and is validated in the reader on the falling edge, as shown in
terminated when the Slave Select signal goes high.
All words must be 8 bits long with the MSB transmitted first.
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Write Address
Byte (0x6C)
No Data Transitions (All High or Low)
B7 B6 B5 B4 B3 B2 B1 B0
Don't Care
B7
Figure 6-17. Procedure for Dummy Read
Figure 6-18. Example of Dummy Read Using SPI With SS
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Read Data in
IRQ Status Register
No Data Transitions (All High or Low)
B6 B5 B4 B3 B2 B1 B0
TRF7970A
TRF7970A
Dummy Read
Ignore
Figure 6-19. Communication is
Detailed Description 39