NXP Semiconductors
UM10858
PN7462 family HW user manual
UM10858
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© NXP B.V. 2018. All rights reserved.
User manual
COMPANY PUBLIC
Rev. 1.4 — 14 May 2018
314514
166 of 345
Bit
Symbol
Access
Value
Description
5
TX_UNDERSHOOT_
PROT_LAST_SC_E
NABLE
R/W
0* - 1
This mode activates the undershoot prevention circuit only
for the last sub-carrier cycle for card-mode transmission.
Note: The bit TX_UNDERSHOOT_PROT_ENABLE must not
be set for this mode.
4:1
TX_UNDERSHOOT_
PATTERN_LEN
R/”
0* - Fh
Defines length of the undershoot prevention pattern (value
+1). The pattern is applied starting from the MSB of the
defined pattern, all other bits are ignored.
0
TX_UNDERSHOOT_
PROT_ENABLE
R/W
0*, 1
If set to 1, the undershoot protection is enabled.
Table 205. CLIF_RX_CONFIG_REG register (address 005Ch)
* = reset value
Bit
Symbol
Access
Value
Description
31
RX_PARITY_EMD_
ON_SO VER
R/W
0*,1
If set, decision if EMD due to parity error is taken at saver
30
RX_MISSING_PARI
TY_IS_EMD
R/W
0*,1
If set, a missing parity bit in the 4th byte is treated as - EMD
(for EMD option 3/4
29
RX_ADVANCED_EM
D_ENABLE
R/W
0*,1
If set, new EMD options for PN7462 family are enabled
28
RX_PARITY_ERRO
R_IS_EMD
R/W
0*, 1
If set to 1 a parity error in the 3rd/4th byte (depending on
RX_EMD_SUP setting) is interpreted as an EMD error.
Otherwise it is interpreted as a parity error.
27:25
RX_EMD_SUP
R/W
0*- 7h
Defines EMD suppression mechanism
000
Off
001
EMD suppression according to ISO14443
010
EMD suppression according to NFC Forum (with respect to
the first 3 characters)
011
EMD suppression according to NFC Forum (with respect to
the first 4characters)
100
EMD suppression according to NFC Forum (with respect to
the first 4characters, all valid frames <4 bytes are ignored)
101 - 111
reserved
24
RX_COLL_IS_DATA
_ERROR
R/W
0*, 1
If set to 1, a collision is treated as a data integrity error
(especially for ISO14443-4)
23
VALUES_AFTER_C
OLLISION
R/W
0*, 1
This bit defined the value of bits received after a collision
occurred.
0
All received bits after a collision will be cleared.
1
All received bits after a collision keep their value.
22
RX_CRC_ALLOW_B
ITS
R/W
0*, 1
Set to 1, a frame with less than one byte length is written to
ram, when the CRC is enabled otherwise it is discarded.
21
RX_FORCE_CRC_
WRITE
R/W
0*, 1
Set to 1, the received CRC byte(s) are written to ram. In
normal operation (if this bit is set to 0) CRC bytes are only
checked and removed from the data stream.
20
RESERVED
R
0
Reserved