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 56 of 172
9.3.3 Information notification
This feature is mainly for debug/trace purpose to inform Host Controller that:
1. An OverCurrent occurs.
2. PMUVCC has changed.
3. External RF Field is present.
This feature is optional for Host Controller.
To setup the notification, the following registry is required
Table 48. Setting for notification
Registry Length
(bytes)
Value(s) comments
NXP_INFO_NOTIFICATION 1 [bit mask] Allow PN544 to send information event
Note: By default the information notification is disabled.
As soon as the information notification is enabled, the host will be notified with the
following events: NXP_EVT_INFO_TXLDO_OVERCUR, NXP_EVT_INFO_PMUVCC or
NXP_EVT_INFO_EXT_RF_FIELD.
9.3.4 Default Secured Element in ‘Power by the Field’ mode
When PN544 is in ‘Power by the Field’ mode, it is able to supply only one Secured
element. This default secured element can be UICC/SIM or NFC-WI/SmartMX.
To setup such a configuration, the SE_Conf data should be set (refer to ‘SE
configur
ation’ chapter).
9.3.5 Autonomous mode
When Host does not want to communicate with PN544 (i.e. when switching OFF the
system) it can send the NXP_EVT_SET_AUTONOMOUS event. If Host is going to
disable PVDD, this event is not mandatory; PN544 will switch in Autonomous mode
automatically.
This event is needed to inform PN544 to switch in Autonomous mode. In this mode,
PN544 will work in Card Emulation mode only.
In Autonomous mode, we can have 2 different behaviors:
• If Vbat>VbatCritical, PN544 is able to supply Secure Element with the help of the
battery.
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