AT88SC0204CA-TU Atmel, AT88SC0204CA-TU Datasheet - Page 40
AT88SC0204CA-TU
Manufacturer Part Number
AT88SC0204CA-TU
Description
Manufacturer
Atmel
Datasheet
1.AT88SC0204CA-TU.pdf
(66 pages)
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
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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
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