mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 83

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
11.2.5 Card communication state diagram
Fig 18. Card communication state diagram
COMMAND REGISTER = IDLE
EOF transmitted and
command = Transmit
SOF transmitted
data transmitted
TxSOF
TxData
TxEOF
Rev. 3.4 — 26 January 2010
(001)
(010)
(011)
(000)
SET
Transmit or Transceive
and command =
FIFO not empty
056634
command = Transceive
EOF transmitted and
end of receive frame
TRANSCEIVE
RxMultiple = 0
COMMAND =
RECEIVE OR
TRANSMIT,
IDLE
(000)
and
command = Receive
signal strength > MinLevel[3:0]
RxWaitC[7:0] = 0
frame received
next bit clock
RECEIVING
Awaiting Rx
Prepare Rx
GoToRx1
GoToRx2
(100)
(101)
(110)
(111)
(100)
ISO/IEC 14443 reader IC
RxMultiple = 1
001aak621
MFRC531
© NXP B.V. 2010. All rights reserved.
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