AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 25

• Manufacturer Part Number: AT88SC0104CA_11
• Description: Atmel CryptoMemory Specification Datasheet
• Manufacturer: ATMEL [ATMEL Corporation]

7.2
Asynchronous Mode for Smart Card Applications
The asynchronous T=0 protocol defined by ISO 7816-3 is used for compatibility with the industry standard smart card readers.
Selecting this mode requires the following power-up sequence, which complies with ISO 7816-3 for a cold reset in smart card
applications.
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.
Table 7-1.
Figure 7-2. Power Up Sequence for Smart Card Mode
Smart card applications that support the two-wire protocol can also use CryptoMemory in the synchronous mode.
CLK-SCL
Atmel Device
AT88SC0104CA
AT88SC0204CA
AT88SC0404CA
AT88SC0808CA
I/O-SDA
•
•
•
•
RST
Power up V
Set I/O-SDA in receive mode
Provide a clock signal to CLK-SCL
RST goes high after 400 clock cycles
V cc
ATR Codes for Lower Density CryptoMemory
CC
; RST, IO-SDA and CLK-SCL are low
$3B
$3B
$3B
$3B
TS
$B2
$B2
$B2
$B2
T0
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
TA(1)
$11
$11
$11
$11
TB(1)
$00
$00
$00
$00
ATR
TD(1)
$10
$10
$10
$10
TA(2)
$80
$80
$80
$80
8664E−CRYPTO−12/11
$00
$00
$00
$00
T1
$01
$02
$04
$08
T2
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