CR14 STMicroelectronics, CR14 Datasheet - Page 29

• Manufacturer Part Number: CR14
• Description: Low Cost Iso14443 Type-b Contactless Coupler Chip With Anti-collision And Crc Management
• Manufacturer: STMicroelectronics

CR14
6.6
6.7
6.8
Transmission Format of Answer Frame Characters
The PICC should use the same character format as that used for output data transfer (see
Figure
An Answer Frame includes the SOF, data, CRC and the EOF, as illustrated in
data transfer rate is 106 kbit/s.
The CR14 will also accept Answer Frames that do not contain the SOF and EOF delimiters,
provided that these Frames are correctly set in the Parameter Register. (See
Answer Start Of Frame
The PICC SOF must be compliant with the ISO14443 type-B, and is shown in
Figure 24. Answer Start Of Frame
Answer End Of Frame
The PICC EOF must be compliant with the ISO14443 type-B, and is shown in
Figure 25. Answer End Of Frame
Ten or eleven Elementary Time Units (ETU) each containing a logical ‘0’,
Two ETUs containing a logical ‘1’.
Ten or eleven Elementary Time Units (ETU) each containing a logical ‘0’,
Two ETUs containing a logical ‘1’
20).
ETU
ETU
b 0
b 0
0
0
b 1
b 1
0
0
b 2
b 2
0
0
b 3
b 3
0
0
b 4
b 4
0
0
b 5
b 5
0
0
6 CR14 ISO14443 type-B Radio Frequency data transfer
b 6
b 6
0
0
b 7
b 7
0
0
b 8
b 8
0
0
b 9
b 9
0
0
b 10
b 10
1
1
b 11
b 11
1
1
b 12
b 12
1
1
Figure
Figure
Figure 24
Figure
26).
26. The
25:
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