AT88SC0104CA_11 ATMEL [ATMEL Corporation], AT88SC0104CA_11 Datasheet - Page 34
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AT88SC0104CA_11
Manufacturer Part Number
AT88SC0104CA_11
Description
Atmel CryptoMemory Specification Datasheet
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT88SC0104CA_11.pdf
(66 pages)
- Current page: 34 of 66
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8.10
8.10.1.1. Write Config Zone
System Write: $B4
Figure 8-11. 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 8-3.
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.
N data bytes
Command Description
Write Config Zone
Write Fuses
Send Checksum
Set User Zone
System Write Command Detail
Host
Command
Address 1
Address 2
Number of bytes N
Data
…
Data
Device
Atmel AT88SC0104CA/0204CA/0404CA/0808CA [Datasheet]
Command
$B4
$B4
$B4
$B4
Addr 1
$00
$01
$02
$03
Addr 2
fuse ID
zone
addr
$00
N ≤ $10
8664E−CRYPTO−12/11
$00
$02
$00
N
Data (N)
N bytes
2 bytes
34
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