at88sc0104c ATMEL Corporation, at88sc0104c Datasheet - Page 47

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

8.5.3.2
8.5.3.3
8.5.3.4
Figure 8-6.
5210A–SMIC–04/07
CLA
**
Write Config Zone
Write Fuses
Set User Zone
System WRITE
Command
INS :
$B4
The maximum number of bytes that may be written is as follows:
Each data byte within a page must only be loaded once. In anti-tearing mode the maximum
value for N is $08 for all devices.
If the address provided at P2 is an unauthorized address, the device will return the "Command
Unauthorized" code ($69 $00) after it has received the header. Since access rights vary through-
out the configuration memory, the host may provide an authorized starting address, but a
number of bytes that causes the device to reach unauthorized address. In this case, the device
will prevent the internal write cycle and no bytes will be written in the EEPROM. At the end of the
command the "Command Unauthorized" code ($69 $00) will be returned instead of $90 $00 to
indicate that no write cycle occurred.
The fuses may only be "programmed", that is written from '1' to '0'. The write fuses operation is
only allowed after successfully presenting the secure code (Write 7 password). The fuses must
be blown sequentially: FAB must be blown first, CMA may be blown only if FAB is ‘0’, and PER
only if CMA is ‘0’.
Table 8-6.
Before reading and writing data in the user zones, the host should select a zone with this com-
mand. At this time the host may choose whether anti-tearing should be active for this zone.
• $10 for AT88SC0104C through AT88SC1616C (EEPROM page size of 16 bytes)
• $40 for AT88SC3216C and AT88SC6416C (EEPROM page size of 64 bytes)
• $80 for AT88SC12816C and AT88SC25616C (EEPROM page size of 128 bytes)
Fuse
CMA
PER
FAB
AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
p
7
--- ---p
P1
Fuse Writing
0
Fuse ID
$06
$04
$00
p
7
--- ---p
P2
0
n
7
P3
--- n
0
Data(1)
Data Sent
...
Data(N)
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