AT88SC25616C-EK Atmel, AT88SC25616C-EK Datasheet - Page 48

• Manufacturer Part Number: AT88SC25616C-EK
• Description: MCU, MPU & DSP Development Tools CRYPTOMEMORY 256K 16 ZONE DEV KIT
• Manufacturer: Atmel

Specifications of AT88SC25616C-EK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.5.4.3
8.5.5
8.5.5.1
Figure 8-5.
Table 8-14.
5210B–SMIC–11/08
CLA
**
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
Verify Password: $BA
Read Fuse Byte
Functional
Verify Password Command Functional Description
Verify Password
3 password bytes
Command
INS :
$BA
Fuse data is returned in the form of a single byte. Bits 0 to 3 represent the fuse states; a value of
‘0’ indicates the fuse has been blown. Bits 4 to 7 are not used as Security Fuses and are
reserved by Atmel.
Table 8-13.
Read password indices : $10 to $17 for passwords 0 to 7.
Write password indices : $00 to $07 for passwords 0 to 7.
Secure code index : $07 (equivalent to Write 7 Password).
Four password index bits "r" and "ppp" indicate the password to compare :
If the maximum number of trials has been exceeded, the device will return $69 $00 instead of
the INS code, after receiving the header, to indicate the command is unauthorized. The device
decrements the associated attempts counter before verifying the password, to prevent attacks. If
the password is correct, the device memorizes this success, clears the pasword attempts coun-
ter and returns $90 $00. If the password is wrong, the device simply returns $69 $00 after
decrementing the attempts count. The Write 7 password is also known as the Secure Code and
must be properly presented before access to the configuration memory is granted when person-
alizing the device
resv
F
7
r = 0: Write password,
r = 1: Read password,
p2p1p0: Password set number.
Verify Password
000r 0p
resv
F
6
P1
2
p
Fuse Byte Description
resv
1
F
p
5
0
Password Index
resv
F
4
Command
P2
**
SEC
Host
PW1
PW2
PW3
F
3
PER
F
2
$03
P3
CMA
F
1
FAB
F
0
d
7
--- ---d
PW1
Device
0
Data Sent
d
15
PW2
--- ---d
8
d
23
--- ---d
PW3
16
45