Texas Instruments TRF7970A Instruction Manual page 38

TRF7970A
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
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
MOSI
B7 B6
MISO
SLAVE
SELECT
38 Detailed Description
Write Address
Byte (0x6C)
No Data Transitions (All High or Low)
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
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Table 6-10).
Dummy Read
Ignore