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NXP Semiconductors
UM191812
PN544 C2 User Manual
191812
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User Manual
Rev. 1.2 — 2010-06-16
71 of 172
9.5.1 Configuration of SWP link
The SWP registry is stored in EEPROM (except NXP_SWP_STATUS (Id ‘02’), which is a
“read only” parameter stored in RAM).
9.5.1.1 Enabling SWP link
By default the SWP link is disabled. The host can enable it using
NXP_SWP_DEFAULTMODE (Id ‘01’) of the registry.
9.5.1.2 Configuring Request Power pin
PN544 may want to communicate with the UICC connected via SWP, while the UICC is
in low power mode. Consequently, PN544 must send an event to the host to indicate it
shall switch the UICC to full power. This event will be automatically sent by the PN544.
The pin used to transmit the power request can be CLKREQ pin (GPIO pin 2) or
PWR_REQUEST pin (GPIO pin 3). The configuration is done by setting the
SwpMgt_Request_Power
EEPROM area. (See
‘
chapter)
9.5.1.3 Changing the baudrate
The default baud-rate used is 848 kbit/s. It may be changed by setting the
SWP_Bitrate
EEPROM area. (See
chapter)
9.5.1.4 Powering the UICC when Vbat < Vbat critical
By default, the UICC is not powered when the PN544 is in low power mode. The host can
configure it to be powered by setting the
SE_Conf (bit 4-5)
EEPROM area.
(See
‘
chapter)
9.5.1.5 Managing UICC rights in card emulation mode and in reader mode
The host can allow or forbid, the UICC to use some RF technologies, in both reader
mode and card emulation mode.
By default, the UICC cannot use any RF technologies of the PN544. The host can give
the UICC the right to use some RF technologies, by setting the
UICC_GateList
EEPROM
area. (See
’
chapter).
In card emulation mode, if a RF technology is disabled, e.g. Type A, a Type A external
reader will not receive any answer from the UICC.
In reader mode, if a RF technology is disabled, e.g. Type A, the UICC is not allowed to
behave as a Type A reader.
Note:
UICC_GateList is
taken into account at SWP activation level (when UICC creates
pipes). It means that Host has to setup these registries before enabling the SWP link
using
NXP_SWP_DEFAULTMODE
.