at88sc0104c ATMEL Corporation, at88sc0104c Datasheet - Page 48

• Manufacturer Part Number: at88sc0104c
• Description: Cryptomemory Specification For Standard Mode Of Operation
• Manufacturer: ATMEL Corporation

8.5.4
8.5.4.1
Figure 8-7.
8.5.4.2
44
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
System READ: $B6
Functional
Read Config Zone
System READ Command Functional Description
Number of Bytes N
Parameter P1
Parameter P2
The System Read command allows reading of the system data from the device. Depending on
the value of the P1 parameter, the host may read the data in the configuration memory, or the
fuses.
Table 8-7.
To read 256 bytes, the host should set N = $00. This is true for any outgoing command, and is
defined by ISO 7816-3. If the address provided at P2 is an unauthorized address, the device will
return the "Command Unauthorized" code ($69 $00) after it has received the header. Since
access rights vary throughout the configuration memory, the host may provide an authorized
starting address, but a number of bytes N that causes the device to reach unauthorized address.
In this case, the device will transmit the authorized bytes, but unauthorized bytes will be
replaced by the "fuse byte" (see below). At the end of this command the "Command Unautho-
rized" code ($69 $00) will be returned instead of $90 $00 to indicate that some of the bytes
returned were not valid.
Figure 8-8.
Command
Read Config Zone
Read Fuse Byte
CLA
Command
**
Host
Command
INS :
$B6
System READ Command Detail
System READ
System READ
p
--p
7
P1
--- -
0
p
--p
7
P2
--- -
CLA
$00
$00
0
n
P3
7
Device
n
---
0
Data
Data
...
Data(
d
---d
$B6
$B6
INS
1)
7
---
0
Data Returned
...
...
d
Data(N)
7
$00
$01
P1
--- ---d
N data bytes
0
addr
$00
P2
5210A–SMIC–04/07
$01
P3
N