Rainbow Electronics AT89C5122 - Manual (Page 72)

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
Data Undefined
Ta Ta+tb Tb+tc
CVCC
CRST
CCLK
CIO Data
T Td=T + te Td + tf
Undefined