Texas Instruments TRF7970A Instruction Manual page 69

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6.14.3.3.5 Special Functions Register (0x11)
Function: Indicate IRQ status for RX operations.
Bit Name
B7 Reserved
B6 Reserved
B5 Reserved
B4 Reserved
B3 Reserved
B2 Reserved
B1 Reserved
Copy of the RX start signal
B0 irg_srx (Bit 6) of the IRQ Status
Register (0x0C)
6.14.3.3.6 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 Name
B7 Reserved
B6 Reserved
B5 Reserved
B4 Reserved
B3 Wlh_1
FIFO high IRQ level (during
RX)
B2 Wlh_0
B1 Wll_1
FIFO low IRQ level (during
TX)
B0 Wll_0
6.14.3.3.7 NFC Low Field Level Register (0x16)
Function: Defines level for RF collision avoidance
Default: 0x00 at POR = H and EN = L.
Bit Name
B7 Clex_dis Disable clock extractor
B6 Hash6 N/A
B5 Hash5 N/A
B4 Hash4 N/A
B3 Hash3 N/A
B2 Rfdet_I2
RF field level for RF
B1 Rfdet_I1
collision avoidance
B0 Rfdet_I0
Copyright © 2011–2014, Texas Instruments Incorporated
Table 6-49. Special Functions Register (0x11)
Function
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Signals the RX SOF was received and the RX is in progress. IRQ when RX is
completed.
Table 6-50. Adjustable FIFO IRQ Levels Register (0x14)
Function
Reserved
Reserved
Reserved
Reserved
Table 6-51. NFC Low Field Level Register (0x16)
Function
NFC passive 106-kbps and ISO14443A card emulation
Comparator output is displayed in B6 of the NFC Target Protocol register
(0x19)
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Description
Description
Wlh_1 Wlh_0
0 0
0 1
1 0
1 1
Wll_1 Wll_0
0 0
0 1
1 0
1 1
Description
TRF7970A
TRF7970A
IRQ Level
124
120
112
96
IRQ Level
4
8
16
32
Detailed Description 69