AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 40

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

8.13
8.13.1 Functional
Verify Password: $BA
Figure 8-17. Verify Password Command Functional Description
Read password indices: $10 to $17 for passwords 0, 1, 2, and 7.
Write password indices: $00 to $07 for passwords 0, 1, 2, and 7.
Secure code index: $07 (equivalent to Write Password 7).
Four password index bits "r" and "ppp" indicate the password to compare:
Figure 8-18. Verify Password
Once the sequence has been carried out, the device requires the host to perform an ACK polling sequence with the system
read command $B6. In order to know whether the inserted password was correct, the host can read the corresponding
attempts counter and verify the value is zero.
S
A
R
T
T
3 password bytes
Command
r = 0
r = 1
p
1011 1010
2
p
1
p
0
: Password set number
: Write password,
: Read password,
A
C
K
000r 0p2p1p0
PW Index
Host
Command
Password Index
PW1
PW2
PW3
A
C
K
Parameter 2
xxxx xxxx
Device
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
A
C
K
0000 0011
N=3
A
C
K
Data x 3
d7--- ---d0
A
C
K
O
S
T
P
8664E−CRYPTO−12/11
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