The Atmel? CryptoRF? family integrates a 13.56MHz RF interface into an Atmel CryptoMemory?。 This product line is ideal for RF tags and contactless smart cards that can benefit from advanced security and cryptographic features. This device is optimized as a contactless secure memory for data storage without the requirement of an internal microprocessor. For communications， the RF interface utilizes the ISO/IEC 14443-2 and -3 Type B bit timing and signal modulation schemes， and the ISO/IEC 14443-3 Slot-MARKER Anticollision Protocol. Data is exchanged half duplex at a 106-kbit per second rate， with a two-byte CRC_B providing error detection capability. The RF interface powers the other circuits; no battery is required. Full compliance with the ISO/IEC 14443-2 and -3 standards and provides both a proven RF communication interface and a robust anticollision protocol. AT88RF04C contains four kilobits of user memory and two kilobits of configuration memory. The two kilobits of configuration memory contain： ? Four sets of read/write passwords ? Four Crypto key sets ? Security access registers for each user zone ? Password/Key registers for each zone The CryptoRF command set is optimized for a multi-card RF communications environment. A programmable AFI register allows this IC to be used in numerous applications in the same geographic area with seamless discrimination of cards assigned to a particular application during the anticollision process.