Texas Instruments TRF7960 Manual page 43

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Continuous Read Operation
Write Address Byte
SCLK
MOSI B7 B6 B5 B4
MISO Don't Care
SS*
Figure 5-11. SPI Interface Communication (Continuous Read Mode)
Note:
Special steps are needed to read the TRF796x IRQ status register (register address 0x0C) in SPI mode.
The status of the bits in this register is cleared after a dummy read. The following steps must be followed
when reading the "IRQ status register".
1. Write in command 0x6C: read 'IRQ status' register in continuous mode (eight clocks).
2. Read out the data in register 0x0C (eight clocks).
3. Generate another eight clocks (as if reading the data in register 0x0D) but ignore the MISO data line.
This is shown in Figure
Special Case – IRQ Status Register Read
SCLK
MOSI B7 B6
MISO
SS*
Figure 5-12. SPI Interface Communication (IRQ Status Register Read)
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Read Data Byte 1
No Data Transitions (All High/Low)
B3 B2 B1 B0
B7 B6 B5
5-12.
Write Address
Byte (0x6C)
B5 B4 B3 B0 No Data Transitions (All High/Low) No Data Transitions (All High/Low)
B2 B1
Don't Care B7 B6
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SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
B4 B3 B2 B1 B0
Read Data in
IRQ Status Register
B5 B4 B3 B2 B1 B0
TRF7960 TRF7961
TRF7960
TRF7961
Read Data Byte n
No Data Transitions (All High/Low)
B7 B6 B5 B4 B3 B2 B1 B0
Dummy Read
Ignore
System Description 43