at88sc0104c ATMEL Corporation, at88sc0104c Datasheet - Page 33

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

7.6.2
7.6.2.1
Figure 7-5.
5210A–SMIC–04/07
Read User Zone: $B2
Functional
Read User Zone Command Functional Description
Number of Bytes N
Read Command
The Read User Zone command $B2 allows reading of data from the device's currently selected
user zone (the procedure for selecting a user zone is described below under
page
The data byte address to be read is defined by Address 1 and Address 2 in the command and is
internally incremented following the transmission of each data byte. The value N defines how
many bytes CryptoMemory will read, a value of zero will result in 256 bytes read. The host how-
ever may cease clocking the device and end the transmission with a NACK and STOP at
anytime prior to receiving all N bytes. During a read operation the address will "roll over" from
the last byte of the current zone, to the first byte of the same zone.
If the host is not allowed to read the zone, the device will not acknowledge the N byte.
Figure 7-6.
Address 1
Address 2
R
S
T
A
T
Host
30).
Command
1011 0010
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
Read User Zone
C
A
K
Address 1
xxxx xxxx
C
A
K
Address 2
xxxx xxxx
Device
Data
Data
...
C
A
K
xxxx xxxx
N
C
A
K
N data bytes
d7--- ---d0
Data
C
A
K
Section 7.6.3 on
Data x N
d7--- ---d0
N
A
C
K
S
O
P
T
29