AT88SC6416CRF-MR1 查看數據表（PDF） - Atmel Corporation

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AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

Appendix O. The ISO/IEC 14443 Type B RF Signal Interface

O.1.

RF Signal Interface

The CryptoRF communications interface is compliant with the ISO/IEC 14443 part 2 and part 3 requirements for Type

B. Type B signaling utilizes 10 % amplitude modulation of the RF field for communication from the reader to the card

with NRZ encoded data. Communication from card to reader utilizes BPSK load modulation of an 847.5 khz subcarrier

with NRZ-L encoded data. The RF field is continuously on for Type B communications.

O.2.

Data Format

Data communication between the card and reader is performed using an LSB first data format. Each byte of data is

transmitted with a 0b start bit and a 1b stop bit as shown in Figure 46. The stop bit, start bit, and each data bit are each

one elementary time unit (ETU) in length (9.4395 microseconds).

Each byte transmission consists of a start bit, 8 data bits (LSB first), and a stop bit. Each byte may be separated from

the next byte by extra guard time (EGT). The EGT may be zero or a fraction of an ETU. EGT cannot exceed 57

microseconds for data transmitted by the PCD. EGT for data transmitted by the CryptoRF PICC is programmed to

either zero or 2 ETUs using the EGTL bit of the Device Configuration Register (DCR). The position of each bit is

measured relative to the falling edge of the start bit.

Figure 46. Byte transmission format requirements for type B communications.

One Byte Transmission is 10 ETUs long plus EGT

Start

LSB

MSB

Stop

EGT

b0

b1

b2

b3

b4

b5

b6

b7

<-- All bit timing is measured from the falling edge of the Start bit

Bit transitions shall occur within (n - 0.125) ETU and (n + 0.125) ETU of the falling edge of start bit

EGT is 0 to 57 uS for PCD transmissions

Despite the fact that data transmissions occur LSB first, all of the commands, data, and CRC bytes in ISO/IEC 14443

and in this specification are listed in the conventional manner, with MSB on the left and LSB on the right.

136 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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