NXP Semiconductors
UM10858
PN7462 family HW user manual
UM10858
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User manual
COMPANY PUBLIC
Rev. 1.4 — 14 May 2018
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139 of 345
3. Erroneous reception - the length byte received indicates a frame length greater than
28. No data is copied to buffer but status byte with LenError bit set is written.
4. Erroneous reception - the length byte is larger than the number of data bytes, which
have been received. Data received is written to buffer and the ProtocolError bit in the
status byte is set.
For each reception, the RX_IRQ in the GENERAL_IRQ_STATUS_REG is set. FW can
disable the IRQ and use a timer for time-out after the last time slot to avoid excessive
interaction with the hardware. At the end of the reception additionally the bit field
RX_NUM_FRAMES_RECEIVED in the register RX_STATUS_REG is updated to
indicate the number of received frames. After the reception of the 8th frame (which is the
maximum supported) a state change to next expected state is executed (IDLE for
Receive command and WaitTransmit for transceive command). Consequently, the
reception is stopped. Upon start of a new reception cycle the flag
RX_NUM_FRAMES_RECEIVED is cleared. The duration between deactivate and
reactivate is at minimum 2 RF cycles and can last up to 2 us.
12.2.4 ISO/IEC 15693 PCD mode
The physical level of the communication is shown in
(1) Reader to Label: 1/256 and 1/4 encoding
(2) Label to Reader: Manchester coding
Fig 30. ISO/IEC 15693 read/write mode communication diagram
The physical parameters are described in
Table 178. ISO/IEC 15693 reader/writer to label communication overview
Communication
direction
Signal type
Transfer speed
f
c
/8192 kbit/s
f
c
/512 kbit/s
Reader to card
Reader side
modulation
10 to 30 % ASK or
100 % ASK
10 to 30 % ASK 90 % to
100 % ASK
Bit encoding
1/256
1/4