AT88SC0204CA-TU Atmel, AT88SC0204CA-TU Datasheet - Page 35

• Manufacturer Part Number: AT88SC0204CA-TU
• Manufacturer: Atmel

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

8.9.
34
System WRITE: $B4
Figure 21. System WRITE Command Functional Description
The System WRITE command allows writing of configuration data to the device. Depending on the value of the
Address 1 parameter, the host may write data in the configuration zone, program the fuses, or set the user zone.
Table 19. System WRITE Command Detail
Write Config Zone
The maximum number of bytes that may be written is $10 and this corresponds to the EEPROM page size. In anti-
tearing mode the maximum value for N is $08 for all devices. A write may be started in the middle of an EEPROM page
but should not extend past the end of the page. If the address provided is an unauthorized address, the device will not
write the requested data. Since access rights vary throughout the configuration zone, the host may provide an
authorized starting address, but a number of bytes that causes the device to reach unauthorized data. In this case, the
device will prevent the internal write cycle and no bytes will be written in the EEPROM. After this command the host
must perform ACK polling.
Atmel AT88SC0104/0204/0404/0808/CA
N data bytes
Write Config Zone
Write Fuses
Send Checksum
Set User Zone
Command Description
Number of bytes N
Command
Address 1
Address 2
Host
Data
Data
…
Device
Command
$B4
$B4
$B4
$B4
Addr 1
$00
$01
$02
$03
Addr 2
fuse ID
zone
addr
$00
N ≤ $10
$00
$02
$00
N
8664C–CRYPT–01/10
Data (N)
N-bytes
2-bytes