NXP Semiconductors PN7462 series User Manual page 156

NXP Semiconductors
Bit Symbol
Table 187. CLIF_CLOCK_CONTROL_REG register (address 0004h)
* = reset value
Bit Symbol
31:3 RESERVED
5 FORCE_TEMP_CLK_
ON_RFOFF
FORCE_PLL_CLOCK_
4
ON_TXACTIVE
3 RESERVED
2 RELEASE_TEMP_CLOCK W
1:0 CLIF_CLOCK_SELECT
UM10858
User manual
COMPANY PUBLIC
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
Access Value
R 0
R/W 0*, 1
R/W 0*, 1
R 0
0*, 1
R/W 0* - 3
0*
1
2
3
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
Description
reserved
If set, to 1, upon RFOFF event the clock is always switched to
temporary-clock, no matter if pll-clock is available.
If set, to 1, clock is automatically switched to DPLL clock for
transmission
reserved
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.
This register controls the source of the CLIF clock (13.56 MHz
contactless frequency clock)
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)
Force RF-clock. RF-clock is chosen as source, no automatic
switching is performed.
Force PLL-clock. PLL-clock is chosen as source, no automatic
switching is performed.
Force Temporary-clock. Temp-clock is chosen as source, no
automatic switching is performed
314514
UM10858
PN7462 family HW user manual
© NXP B.V. 2018. All rights reserved.
156 of 345