at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 72

• Manufacturer Part Number: at83c5122
• Description: At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
• Manufacturer: ATMEL Corporation

Power-on and Power-off FSM
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AT8xC5122/23
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
Figure 37. SCIB Activation Cold Reset Sequence after a Card Insertion
The Warm Reset Activation Terminal procedure is as follow and the Figure 38
Figure 38. SCIB Activation Warm Reset Sequence
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–
–
–
–
–
–
–
–
–
CCLK
CCLK
CRST
CRST
CIO
CIO
CVCC
CVCC
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)
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)
Undefined
Undefined
Ta
T
Ta+tb
Td=T + te
Tb+tc
Td + tf
Data
Data
4202E–SCR–06/06