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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.14.3.3.5 Special Functions Register (0x11)
Table 6-49. Special Functions Register (0x11)
Function: Indicate IRQ status for RX operations.
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Bit
B7
B6
B5
B4
B3
B2
B1
B0
Name
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
irg_srx
Function
Copy of the RX start signal
(Bit 6) of the IRQ Status
Register (0x0C)
Description
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Signals the RX SOF was received and the RX is in progress. IRQ when RX is
completed.
6.14.3.3.6 Adjustable FIFO IRQ Levels Register (0x14)
Table 6-50. Adjustable FIFO IRQ Levels Register (0x14)
Function: Adjusts level at which FIFO indicates status by IRQ
Default: 0x00 at POR = H and EN = L
Bit
B7
B6
B5
B4
Name
Reserved
Reserved
Reserved
Reserved
Function
Reserved
Reserved
Reserved
Reserved
Description
B3
Wlh_1
Wlh_1
Wlh_0
IRQ Level
B2
Wlh_0
FIFO high IRQ level (during
RX)
0
0
1
0
1
0
124
120
112
1
1
96
B1
Wll_1
Wll_1
Wll_0
IRQ Level
B0
Wll_0
FIFO low IRQ level (during
TX)
0
0
1
0
1
0
4
8
16
1
1
32
6.14.3.3.7 NFC Low Field Level Register (0x16)
Table 6-51. NFC Low Field Level Register (0x16)
Function: Defines level for RF collision avoidance
Default: 0x00 at POR = H and EN = L.
68
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Name
Clex_dis
Hash6
Hash5
Hash4
Hash3
Rfdet_I2
Rfdet_I1
Rfdet_I0
Detailed Description
Function
Disable clock extractor
N/A
N/A
N/A
N/A
RF field level for RF
collision avoidance
Description
NFC passive 106-kbps and ISO14443A card emulation
Comparator output is displayed in B6 of the NFC Target Protocol register
(0x19)
Copyright ? 2011–2014, Texas Instruments Incorporated
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