AT88SC102 데이터 시트보기 (PDF) - Unspecified

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AT88SC102

1K EEPROM– Security Logic with Two Application Zones

Unspecified 

AT88SC102

6. Memory Zones

Table 6-1. Memory Zones

Zone

Definition

EC2EN Fuse

(1 bit)

This single-bit EEPROM fuse selects whether the EC2 counter is used to limit the number of AZ2

erase operations in Security Mode 2. If the EC2EN fuse is unblown (“1”), the number of erase

operations allowed in AZ2 is limited to 128. If the EC2EN fuse is blown (“0”), there is no limit to the

number of erase operations in AZ2. After the issuer fuse is blown, the state of the EC2EN fuse is

locked and cannot be changed.

Issuer Fuse

(16 bits)

This EEPROM fuse is used to change the security mode of the AT88SC102 from Security Mode 1

(“1”) to Security Mode 2 (“0”). Initialization of the AT88SC102 for use by the end customer occurs in

Security Mode 1. Access conditions in Security Mode 1 are described in Table 1. Access conditions in

Security Mode 2 are described in Table 2.

Manufacturer’s Fuse

(1 bit)

This single-bit EEPROM fuse is used to lock the data stored in the manufacturer’s zone after

personalization has been completed.

7

1419C–SMEM–6/08

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