AT88SC0808C-PU データシートの表示（PDF） - Atmel Corporation

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AT88SC0808C-PU

CryptoMemory 8 Kbit

Atmel Corporation 

AT88SC0808C

Security Fuses

Protocol Selection

Asynchronous

T = 0 Protocol

There are three fuses on the device that must be blown during the device personaliza-

tion process. Each fuse locks certain portions of the configuration memory as OTP

memory. Fuses are designed for the module manufacturer, card manufacturer and card

issuer and should be blown in sequence, although all programming of the device and

blowing of the fuses may be performed at one final step.

The AT88SC0808C supports two different communication protocols.

• Smart Card Applications: The asynchronous T = 0 protocol defined by ISO 7816-3

is used for compatibility with the industry’s standard smart card readers.

• Embedded Applications: A 2-wire serial interface is used for fast and efficient

communication with logic or controllers.

The power-up sequence determines which of the two communication protocols will be

used.

This power-up sequence complies with ISO 7816-3 for a cold reset in smart card

applications.

• VCC goes high; RST, I/O-SDA and CLK-SCL are low.

• Set I/O-SDA in receive mode.

• Provide a clock signal to CLK-SCL.

• RST goes high after 400 clock cycles.

The device will respond with a 64-bit ATR code, including historical bytes to indicate the

memory density within the CryptoMemory family. Once the asynchronous mode has

been selected, it is not possible to switch to the synchronous mode without powering off

the device.

Figure 10. Asynchronous T = 0 Protocol (Gemplus Patent)

Vcc

I/O-SDA

ATR

RST

CLK-SCL

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.

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2024HS–SMEM–04/07

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