AT88SC0204CA-TU Atmel, AT88SC0204CA-TU Datasheet - Page 40

• Manufacturer Part Number: AT88SC0204CA-TU
• Manufacturer: Atmel

Specifications of AT88SC0204CA-TU

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Compliant

8.12. Verify Password: $BA
8.12.1. Functional
8664C–CRYPT–01/10
Figure 27. 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 28. 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.
R
S
T
A
T
3 password bytes
Command
r = 0
r = 1
p
1011 1010
2
p
1
p
0
: Password set number.
: Write password,
: Read password,
C
A
K
000r 0p2p1p0
PW Index
Password Index
Command
Host
PW1
PW2
PW3
A
C
K
Parameter 2
xxxx xxxx
Atmel AT88SC0104/0204/0404/0808/CA
A
C
K
0000 0011
Device
N=3
A
C
K
Data x 3
d7--- ---d0
A
C
K
O
S
T
P
39