at88sc0104c ATMEL Corporation, at88sc0104c Datasheet - Page 46

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

8.5.3
8.5.3.1
Figure 8-5.
42
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
System WRITE: $B4
Functional
System WRITE Command Functional Description
N data bytes
The System Write command allows writing of system data to the device. Depending on the value
of the P1 parameter, the host may write data in the configuration memory, program the fuses or
set the user zone.
Table 8-4.
The anti-tearing function is controlled by P1: the host may choose to write in the configuration
memory with anti-tearing enabled by setting P1 = $08 instead of $00. Similarly, the host may
choose to activate anti-tearing for a user zone by carrying out the Set User Zone command with
P1 = $0B instead of $03. All subsequent Write User Zone commands are then carried out with
anti-tearing enabled until the next Set User Zone command. Anti-tearing should be turned off if
not required, as it would otherwise cause more write cycles than necessary.
Table 8-5.
Command
Write Config Zone
(Devices 0104C-1616C)
Write Config Zone
(Devices 3216C-6416C)
Write Config Zone
(Devices 12816C-25616C)
Write Fuses
Set User Zone
Command
Write Config Zone w/a-t
Set User Zone w/a-t
System WRITE Command Detail
Anti-Tearing
Number of Bytes N
Parameter P1
Parameter P2
Command
Host
Data
Data
...
CLA
CLA
$00
$00
$00
$00
$00
$00
$00
$B4
$B4
$B4
$B4
$B4
$B4
$B4
INS
INS
$0B
$00
$00
$00
$01
$03
$08
P1
P1
Device
fuse ID
zone
zone
addr
addr
addr
addr
P2
P2
N ≤ $10
N ≤ $40
N ≤ $80
N ≤ $08
$00
$00
$00
P3
P3
5210A–SMIC–04/07
Data(N)
N bytes
N bytes
N bytes
N bytes
Data(N)