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

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AT88SC0404C-MP
(Rev.:2009)

CryptoMemory® 4 Kbit

Atmel Corporation 

8. Security Fuses

There are three fuses on the device that must be blown during the device personalization 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.

9. Protocol selection

The AT88SC0404C 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.

9.1.

Asynchronous T = 0 Protocol

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

10 AT88SC0404C

2023KS–SMEM–10/09

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