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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
The procedure for a dummy read is as follows:
1. Start the dummy read:
(a) When using slave select (SS): set SS bit low.
(b) When not using SS: start condition is when Data Clock is high (see Table 6-10 ).
2. Send address word to IRQ status register (0x0C) with read and continuous address mode bits set to 1
(see Table 6-10 ).
3. Read 1 byte (8 bits) from IRQ status register (0x0C).
4. Dummy-read 1 byte from register 0x0D (collision position and interrupt mask).
5. Stop the dummy read:
(a) When using slave select (SS): set SS bit high.
(b) When not using SS: stop condition when Data Clock is high.
DATA _CLK
Write Address
Byte (0x6C)
Read Data in
IRQ Status Register
Dummy Read
MOSI
B7
B6
B5
B4
B3
B2
B1
B0
No Data Transitions (All High or Low)
No Data Transitions (All High or Low)
MISO
Don’t Care
B7
B6
B5
B4
B3
B2
B1
B0
Ignore
SLAVE
SELECT
Figure 6-17. Procedure for Dummy Read
Figure 6-18. Example of Dummy Read Using SPI With SS
Copyright ? 2011–2014, Texas Instruments Incorporated
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