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AT88SC1003 Fiches technique(PDF) 8 Page - ATMEL Corporation

No de pièce AT88SC1003
Description  Vpp Internally Generated for Single Voltage Operation
Download  30 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT88SC1003 Fiches technique(HTML) 8 Page - ATMEL Corporation

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2035C–SMEM–6/08
AT88SC1003
Application Zone 3
AZ3 (512 bits)
AZ3 is intended to hold user application data. P3 (address 1024) controls write access and R3
(address 1025) controls read access within Zone 3. In Security Level 1, erasing AZ3 is accomplished
by performing an erase operation on any bit within AZ3 after verification of the security code (SV flag
= 1). This operation will erase the entire zone. In Security Level 2, erase operations are controlled by
both the SV flag and the erase key EZ3. See
Table 14-1 on page 16 for specific details. There is no
limit to the number of erase operations performed in AZ3. In Security Level 1, write operations in AZ3
may be performed on single bits after verification of the security code. In Security Level 2, the P3 bit
must also be set to “1” to allow single bit write operations. Read operations in Securtiy Levels 1 and 2
are allowed if either R3 is set to “1” or the SV flag is set to “1” by validating the security code.
Application Zone 3
Erase Key EZ3
(1 bit)
The erase keys are passwords used to control erase operations within the application zones after the
issuer fuse has been blown (Security Level 2). The erase key password is written during
personalization (Security Level 1) after verification of the security code. EZ3 can not be changed after
the issuer fuse is blown. In Security Level 2, AZ3 can be erased only after both the security code and
the EZ3 password have been validated. Verification of EZ3 will set the internal flag E3 to “1”.
Application Zone 3
Erase Bit EB3
(1 bit)
Address location 1584 is designated as the erase bit for Application Zone 3. The erase protocol for an
AT88SC1003 in Security Mode 2 requires that the erase key (EZ3) be verified, then an erase
operation must be executed on the next bit following the erase key. This action will result in erasing the
entire zone.
Unused
(16 bits)
Address locations 1585–1599 are not functional in the AT88SC1003. If the address counter is
incremented beyond address 1599, the counter will roll over to address 0. The counter can also be
reset to “0” by executing a reset command.
Table 6-1.
Memory Zones (Continued)
Zone
Definition


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