AT88RF1354_09 ATMEL [ATMEL Corporation], AT88RF1354_09 Datasheet - Page 26

• Manufacturer Part Number: AT88RF1354_09
• Description: 13.56 MHz Type B RF Reader Specification
• Manufacturer: ATMEL [ATMEL Corporation]

A.4.
A.5.
26
Figure A-2.
Start of Frame
Reader Data Transmission
The unmodulated 13.56 Mhz carrier signal amplitude which is transmitted when the reader is idle is defined as logical
“1”, while the modulated signal level is defined as logical “0”. A frame transmitted by the reader consists of SOF,
several bytes of data, a 2 byte CRC_B, and the EOF.
Figure A-3.
Card Data Transmission
The PICC waits silently for a command from the PCD after being activated by the RF field. After receiving a valid
command from the PCD, the PICC is allowed to turn on the subcarrier only if it intends to transmit a complete response
frame. The PICC response consists of TR1, SOF, several bytes of data followed by a 2 byte CRC_B, and the EOF.
The subcarrier is turned off no later than 2 ETUs after the EOF. Figure A-4. show the PICC frame format.
13.56 MHz Type B RF Reader Specification
No Modulation ("1"s)
End of Frame
Start of Frame (SOF) and End of Frame (EOF) format requirement
Format of a frame transmitted by the reader to the card.
Last Byte
SOF
Total start of frame length is 12 to 14 ETUs.
10 to 11 ETUs of "0"s
Command, Data, and CRC_B
Total end of frame length is 10 to 11 ETUs.
Data Transmission
10 to 11 ETUs of "0"s
2 to 3 ETUs "1"s
EOF
No Modulation ("1"s)
Start b0
First Byte
8547B–RFID–3/09
b1