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3. Erroneous reception - the length byte received indicates a frame length greater than
4. Erroneous reception - the length byte is larger than the number of data bytes, which
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
The physical parameters are described in
Table 178. ISO/IEC 15693 reader/writer to label communication overview
Communication
Signal type
direction
Reader side
Reader to card
modulation
Bit encoding
UM10858
User manual
COMPANY PUBLIC
28. No data is copied to buffer but status byte with LenError bit set is written.
have been received. Data received is written to buffer and the ProtocolError bit in the
status byte is set.
(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
f
/8192 kbit/s
c
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
Table
178.
Transfer speed
10 to 30 % ASK or
100 % ASK
1/256
314514
UM10858
PN7462 family HW user manual
Fig
30.
f
/512 kbit/s
c
10 to 30 % ASK 90 % to
100 % ASK
1/4
© NXP B.V. 2018. All rights reserved.
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