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
156 of 345
Bit
Symbol
Access
Value
Description
Note
: The transceive command does not finish automatically. It stays in
the transceive cycle until stopped via the IDLE/ StopCom command
4
KeepCommand command; This command does not change the
content of the command register and might be used in case other bits
in the register are to be changed
5
LoopBack command; This command is for test purposes only. It starts
a transmission and at the same enables the receiver.
6
PRBS command: This command will start a transmission with the given
protocol settings, transmitting a predefined pseudo-random data
stream. The command will not return automatically.
7
Reserved: Do not use this setting
Table 187. CLIF_CLOCK_CONTROL_REG register (address 0004h)
* = reset value
Bit
Symbol
Access
Value
Description
31:3 RESERVED
R
0
reserved
5
FORCE_TEMP_CLK_
ON_RFOFF
R/W
0*, 1
If set, to 1, upon RFOFF event the clock is always switched to
temporary-clock, no matter if pll-clock is available.
4
FORCE_PLL_CLOCK_
ON_TXACTIVE
R/W
0*, 1
If set, to 1, clock is automatically switched to DPLL clock for
transmission
3
RESERVED
R
0
reserved
2
RELEASE_TEMP_CLOCK W
0*, 1
Setting this register bit to 1 will release the temporary clock and
switch back to functional mode.
Note
: In normal operation, this bit must not be set.
1:0
CLIF_CLOCK_SELECT
R/W
0* - 3
This register controls the source of the CLIF clock (13.56 MHz
contactless frequency clock)
0*
Automatic clock selection. The source of the clock is
automatically chosen depending on the RF-Field status. If an
external RF-Field is detected the
RF-clock is chosen otherwise the PLL-clock (independent if it is
available)
1
Force RF-clock. RF-clock is chosen as source, no automatic
switching is performed.
2
Force PLL-clock. PLL-clock is chosen as source, no automatic
switching is performed.
3
Force Temporary-clock. Temp-clock is chosen as source, no
automatic switching is performed