Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 72)

AT8xC5122/23

4202E–SCR–06/06

Power-on and Power-off FSM The Power-on Power-off Finite State Machine (FSM) applies the signals on the smart

card in accordance with ISO7816-3 standard. It conducts the Activation (Cold Reset and

Warm Reset as well as De-Activation) it also manages the exception conditions such as

overcurrent (see DC/DC Converter)

To be able to power on the SCIB, the card presence is mandatory. Upon detectection of

a card presence, the Terminal initiate a Cold Reset Activation.

The Cold Reset Activation Terminal procedure is as follow and the Figure 37. Timing

indications are given according to ISO IEC 7816

– RESET= Low , I/O in the receive state

– Power Vcc (see DC/DC Converter)

– Once Vcc is established, apply Clock at time Ta

– Maintain Reset Low until time Ta+tb (tb< 400 clocks)

– Monitor The I/O line for the Answer To Reset (ATR) between 400 and 40000

clock cycles after Tb. ( 400 clocks < tc < 40000clocks)

Figure 37. SCIB Activation Cold Reset Sequence after a Card Insertion

The Warm Reset Activation Terminal procedure is as follow and the Figure 38

– Vcc active, Reset = High, CLK active

– Terminal drive Reset low at time T to initiate the warm Reset. Reset=0

maintained for at least 400 clocks until time Td = T+te (400 clocks < te)

– Terminal keep the IO line in receive state

– Terminal drive Reset high after at least 400 clocks at time Td

– ICC shall respond with an ATR within 40000 clocks (tf<40000 clocks)

Figure 38. SCIB Activation Warm Reset Sequence

CVCC

CRST

CCLK

CIO

DataUndefined

Ta Ta+tb

Tb+tc

CVCC

CRST

CCLK

CIO

Data

T Td=T + te

Td + tf

Undefined

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Rainbow-electronics AT89C5122 Manual de usuario Pagina 72