AT88SC0404C-MP(2009) 데이터 시트보기 (PDF) - Atmel Corporation

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AT88SC0404C-MP
(Rev.:2009)

CryptoMemory® 4 Kbit

Atmel Corporation 

AT88SC0404C

9.2.

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 2345

Note: Five clock pulses must be sent before the first command is issued.

10. 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

Standard

clear

Authentication

clear

Encryption

clear

User Data

clear

clear

encrypted

Passwords

clear

encrypted

encrypted

Data Integrity Check

MDC(1)

MAC(1)

MAC(1)

Note:

1. Configuration data include viewable areas of the Configuration Zone except the passwords:

MDC: Modification Detection Code

MAC: Message Authentication Code.

11

2023KS–SMEM–10/09

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