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AT88SC102

1K EEPROM– Security Logic with Two Application Zones

Unspecified 

3. Terminology

The following terms have specific definitions for the AT88SC102.

3.1 Erase

Erase is a program operation that results in an EEPROM data bit being set to a logic “1” state.

Outside the application zones, all erase operations are performed on 16-bit words. An erase

operation performed on any bit within a word will execute an erase of the entire word. Inside the

application zones, erase operations are controlled by the SV flag, EZ passwords, and EC2EN

fuse. These operations are defined in the “Device Operation” section of the data sheet.

3.2 Write

Write is a program operation that results in an EEPROM bit or word being set to a logic “0” state.

An unwritten bit is defined as erased or set to a logic “1” state. Write operations in the

AT88SC102 may be performed on individual bits after security code validation. In Security Level

2, write operations also require that the P1 or P2 bit within the application zone is set to “1”.

3.3 Program

Program is an EEPROM function that activates internally timed, high-voltage circuitry and

results in a data bit or word being set to either a logic “0” or “1” state.

3.4 Bit

A bit is a single data element set to either a logic “0” or “1” state. All bit addresses within the

application zones (AZ1, AZ2) may be written individually.

3.5 Byte

A byte is eight consecutive data bits. A byte boundary will begin on an address that is evenly

divisible by eight. The AT88SC102 has no capability for byte write operations.

3.6 Word

A word is sixteen consecutive data bits. A word boundary will begin on an address that is evenly

divisible by 16. Erase operations will always operate on 16-bit words when applied to addresses

outside the application zones. In Security Level 1, erase operations within the application zones

also operate on 16-bit words. In Security Level 2, erase operations within the application zones

operate on the entire zone. Write operations function on single bits, not words, in both security

levels.

3.7 Blown

In reference to an AT88SC102 internal EEPROM fuse, the blown state is a logic “0”.

3.8 Unblown

In reference to an AT88SC102 internal EEPROM fuse, the unblown state is a logic “1”.

3.9 Verification

AT88SC102 operations are controlled by the state of several internal flags. The flags SV, E1,

and E2 are set after verification of an associated password (security code or EZ1 or EZ2 respec-

tively). Verification is accomplished by executing an INC/CMP operation, which correctly

2 AT88SC102

1419C–SMEM–6/08

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