AT88SC0404CA-MJ Atmel, AT88SC0404CA-MJ Datasheet - Page 49

• Manufacturer Part Number: AT88SC0404CA-MJ
• Description: IC EEPROM 4KBIT 4MHZ M2J
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-MJ

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 4MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: M2 J, Smart Card Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.7. System WRITE: $B4
10.7.1. Functional
48
Figure 32. 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 29. 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 30. Anti-Tearing
Atmel AT88SC0104/0204/0404/0808/CA
N data bytes
Write Config Zone
Write Fuses
Send Checksum
Set User Zone
Write Config Zone w/ a-t
Set User Zone w/ a-t
Command
Command Description
Number of bytes N
Address P1
Address P2
Command
Host
Data
Data
…
CLA
$00
$00
$00
$00
Device
INS
$B4
$B4
$B4
$B4
CLA
$00
$00
$00
$01
$02
$03
$B4
$B4
INS
P1
$0B
$08
P1
fuse ID
zone
addr
$00
P2
zone
addr
P2
N ≤ $10
$00
$02
$00
P3
N ≤ $08
$00
P3
8664C–CRYPT–01/10
Data(N)
N-bytes
2-bytes
Data(N)
N-bytes