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AT88SC1616C_JYP Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT88SC1616C_JYP Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 20 page AT88SC1616C 11 2030KS–SMIC–10/09 11.2. Synchronous 2-wire Serial Interface The synchronous mode is the default after powering up VCC due to an internal pull-up on RST. For embedded applications using CryptoMemory in standard plastic packages, this is the only communication protocol. • Power-up VCC, RST goes high also. • After stable VCC, CLK-SCL and I/O-SDA may be driven. Figure 11. Synchronous 2-wire Protocol Vcc I/O-SDA RST CLK-SCL 1 2 3 45 Note : Five clock pulses must be sent before the first command is issued. 12. Communication Security Modes Communications between the device and host operate in three basic modes. Standard mode is the default mode for the device after power-up. Authentication mode is activated by a successful authentication sequence. Encryption mode is activated by a successful encryption activation following a successful authentication. Table 4. Communication Security Modes (1) Mode Configuration Data User Data Passwords Data Integrity Check Standard clear clear clear MDC Authentication clear clear encrypted MAC Encryption clear encrypted encrypted MAC Note : 1. Configuration data include viewable areas of the Configuration Zone except the passwords: MDC: Modification Detection Code MAC: Message Authentication Code. |
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