Specifications

70
Power saving control at card polling
It is possible to save power consumption by search IC card with adjust to long as radio wave
sending period.
But sending period will be longer than before, then IC card detect response will be down.
Please try to use this method for long time continuously IC card waiting case.
Data Communication Functions
Data communication becomes possible once the smart card has been activated by the card polling
function. Communication ends once the NFC module has received the response information from
the smart card in response to a transmitted command or when the timeout elapses.
When the communication is successful, the smart card remains in the activated mode, thus
enabling consecutive transmission of other data.
Table 2.54
Function Description Termination Criteria Timeout
Card polling Searches smart cards within
communication range and,
upon detection, activates
smart card and retrieves its
response information.
− Smart card is successfully activated
and card information is retrieved.
− Timeout elapses.
− Assigned callback function returns
'FALSE'.
− 'Stop polling' function is carried out.
In the range of
100 to 60,000
milliseconds
or
no timeout.
Data
communicati
on
Data communication can
be performed with
successfully activated smart
card.
− Smart card response information has
been received.
− Timeout elapses.
60 milliseconds
(see note)
Note:
A timeout occurs if the wait time, starting when the NFC module transmits a command to smart
card until when the NFC receives a response from the smart card, elapses 60 milliseconds.