AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 49
AT88SC0104CA_11
Manufacturer Part Number
AT88SC0104CA_11
Description
Atmel CryptoMemory Specification Datasheet
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT88SC0104CA_11.pdf
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10.7
10.7.1 Functional
System WRITE: $B4
Figure 10-4. System Write Command Functional Description
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, send a checksum or set the user zone.
Table 10-5. System Write Command Detail
The anti-tearing function is controlled by P1: the host may choose to write in the configuration zone 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 10-6. Anti-tearing
N data bytes
Command
Write Config Zone
Write Fuses
Send Checksum
Set User Zone
Command Description
Write Config Zone w/ a-t
Set User Zone w/ a-t
Host
Command
Address P1
Address P2
Number of bytes N
Data
…
Data
CLA
$00
$00
$00
$00
Device
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
$B4
$B4
$B4
$B4
INS
CLA
$00
$00
INS
$B4
$B4
$00
$01
$02
$03
P1
$0B
$08
P1
fuse ID
zone
addr
$00
P2
zone
addr
P2
N ≤ $10
8664E−CRYPTO−12/11
$00
$02
$00
P3
N ≤ $08
$00
P3
Data(N)
N bytes
2 bytes
Data(N)
N bytes
49
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