Rainbow-electronics MAX66040 Manual do Utilizador descarregar pdf (Página 5)

MAX66040

ISO/IEC 14443 Type B-Compliant

Secure Memory

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ISO/IEC 14443 Type B

Communication Concept

The communication between the master and the

MAX66040 (slave) is based on the exchange of data

packets. The master initiates every transaction; only

one side (master or slaves) transmits information at any

time. Data packets are composed of characters, which

always begin with a START bit and typically end with

one or more STOP bits (Figure 5). The least significant

data bit is transmitted first. Data characters have 8 bits.

Each data packet begins with a start-of-frame (SOF)

character and ends with an end-of-frame (EOF) charac-

ter. The EOF/SOF characters have 9 all-zero data bits

(Figure 6). The SOF has 2 STOP bits, after which data

characters are transmitted. A data packet with at least

3 bytes between SOF and EOF is called a frame

(Figure 7). The last two data characters of an

START

BIT 1

BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8

LSB MSB

STOP

Figure 5. ISO/IEC 14443 Data Character Format

ABRIDGED DATA SHEET

1 2 3 4 5 6 7 8 9 10 ... 24 25

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