NXP Semiconductors
UM191812
PN544 C2 User Manual
191812
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User Manual
Rev. 1.2 — 2010-06-16
86 of 172
9.6.2.5 NXP_PL_EMULATION, NXP_PL_PAUSE parameters
NXP_PL_EMULATION
and
NXP_PL_PAUSE
timings have sense only when a reader
sequence has been started by
NXP_PL_RDPHASES.
As the Polling Loop is running, Emulation & Pause modes have a different meaning:
Emulation
mode means
card emulation
mode (either from Host or UICC or SmartMX) as
well as NFC Target. In this mode, the PN544 is seen as a contact less card and as a
NFC Target. For details on UICC and SmartMX setup, refer to SWP & NFC-WI chapters.
Pause
mode means
no action
; PN544 does not perform any action.
Note: Refer to
PWR_STATUS
(See
chapter
)
to set the default power mode of
Emulation or Pause phases.
Reader Phase
Card Emulation Phase Duration set by
NXP_PL_EMULATION
Pause Phase Duration set by NXP_PL_PAUSE
Emulation
Phase
Pause Phase
Reader Phase
(1)
Fig 48. Emulation or Pause Phase
Here is a view of the different Polling Loop possibilities:
No phase started:
If no sequence (neither reader nor emulation) has been started, the PN544 stays
infinitely in the default power mode (Refer to
PWR_STATUS
EEPROM area.). In such a
mode, the Emulation can be enabled according to SWP and NFC-WI.
One Emulation phase only:
If no reader phase has been enabled nor pause phase, the emulation phase will be
infinite. As long as there is no external reader, the PN544 is in Card Emulation mode,
with RF level detector active. To save power, the default power mode should be set to
standby
.