AT88SC0104C datasheet(38/58 Pages) ATMEL

38 / 58 page

5210B–SMIC–11/08

AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C

8.3

PPS Support

All CryptoMemory devices with user memory sizes 32Kbits and larger support the Protocol and

Parameter Selection (PPS) protocol, section 7 of ISO 7816-3. This section only applies to these

larger devices; PPS is not supported by CryptoMemory with memory sizes 16K bit or smaller.

At the end of an ATR sequence, subsequent to either a cold or a warm reset initiated by the

reader, the device will be expecting either a ‘Class’ byte as part of a command header, or the ini-

tial character, PPSS, of a PPS request. If the device receives a byte = $FF, it will process

subsequent incoming bytes as a PPS request. In all other cases, it will proceed with command

processing. There are 4 bytes that comprise a PPS request or response;

• Initial Character PPSS. Always equal to $FF.

• Format Character PPS0. CryptoMemory supports two response values for PPS0, $00 and

$01. See ISO 7816 for further definition of PPS0.

• Parameter Character PPS1. Encodes Fn and Dn in the same manner as TA(1) in the ATR

• Checksum PCK.

The following table shows the PPS1 values supported by CryptoMemory devices with memory

sizes 32K bits and above.

Table 8-1.

PPS1 Values CryptoMemory Supports

f Max

4 MHz

5 MHz

0000b

0001b

1001b

372

512

0001b

PPS1

F/D

372

baud rate

9600

0010b

PPS1

F/D

186

baud rate

19200

0011b

PPS1

F/D

baud rate

38400

0100b

PPS1

F/D

46.5

baud rate

76800

55800

0101b

PPS1

F/D

23.25

baud rate

153600

111600

1000b

PPS1

F/D

baud rate

115200

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