AT88RF04C-WA1 Atmel, AT88RF04C-WA1 Datasheet - Page 137

• Manufacturer Part Number: AT88RF04C-WA1
• Manufacturer: Atmel

Specifications of AT88RF04C-WA1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

O.3.
O.4.
5276C–RFID–3/09
Frame Format
Data transmitted by the PCD or PICC is sent as frames. The frame consists of the start of frame (SOF), several bytes
of information, and the end of frame (EOF). The SOF and EOF requirements are shown in Figure 47.
Figure 47.
Starte of Frame
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 48.
Reader Data Transmission
No Modulation ("1"s
End of Frame
No Modulation
Start of Frame (SOF) and End of Frame (EOF) format requirements.
Format of a frame transmitted by the reader to the card.
)
Last Byte
SOF
AT88SC0808/1616/3216/6416CRF, AT88RF04C
Total Start of Frame Length is 12 to 14 ETUs
10 to 11 ETUs of “0”s
C
o
m
m
Data Transmission
and, Data a
Total Start of Frame Length is 10 to 11 ETUs
10 to 11 ETUs of “0”s
n
d
C
R
C
_
B
2 to 3 ETUs “1”s
EOF
N
o
M
Start
o
d
First Byte
ulation ("1"s)
b0
137
b1