AN2284 datasheet(29/40 Pages) STMICROELECTRONICS

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AN2284

8 SC Reader Lib: Description

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- SC_RESET_LOW

- SC_RESET_HIGH

- SC_ACTIVE

- SC_ACTIVE_ON_T0

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SC_POWER_OFF

No power is provided to the smart card (Vcc=0); the STR7 smart card peripheral is

disabled. No clock is provided to smart card.

●

SC_POWER_ON

The smart card peripheral is enabled and initialized; no power is provided to the smart card;

no clock is provided to the smart card.

●

SC_RESET_LOW and SC_RESET_HIGH

In SC_RESET_LOW RST, the pin on the smart card (pin 2) is hold to zero (RST=0).

Vcc=5V is provided to the smart card; clock CLK is provided to the smart card. Answer to

reset (ATR) procedure begins. The reader waits for an ATR frame from the smart card. If no

answer is received, the reader forces reset pin RST high (RST=1) and waits again for an

answer to reset in the SC_RESET_HIGH state.

●

SC_ACTIVE

If an answer to reset is received, the reader goes in active state and decodes the ATR

frame. It returns information about the used protocol.

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SC_ACTIVE_ON_T0

If the used protocol is T0, the reader goes in SC_ACTIVE_ON_T0 state and allows to send

commands to the smart card.

AN2284 Datasheet(PDF) 29 Page - STMicroelectronics