AT88SC102 查看數據表（PDF） - Unspecified

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AT88SC102

1K EEPROM– Security Logic with Two Application Zones

Unspecified 

Table 12-1. Device Functional Operation (Continued)

Name

Functional Operation Sequence

Blowing

Manufacturer

Fuse

Valid in Security Level 1.

OPERATION:

Set address counter between address 1456 and 1471.

SV must be set.

The FUS pin can be either a “0” or a “1”.

RST pin = “1”

Perform a write operation.

FUNCTION:

The manufacturer fuse will be at a logic “0” state.

Note: The address will not change as long as RST is high. CLK should be low when RST is brought low.

This will reset the address counter to “0”.

Blowing

EC2EN Fuse

Valid in Security Level 1.

The EC2EN fuse must be blown before the issuer fuse is blown.

OPERATION:

Set the address counter to address 1529.

FUS pin = “1”

RST pin = “1”

Perform a write operation.

FUNCTION:

EC2EN fuse will be written to a logic “0” state.

Note: The address will not change as long as RST is high. CLK should be low when RST is brought low

This will reset the address counter to “0”.

Blowing Issuer

Fuse

OPERATION:

Set address counter between address 1552 and 1567.

SV must be set.

The FUS pin can be either a “0” or a “1”.

RST pin = “1”

Perform a write operation.

FUNCTION:

The issuer fuse will be set to a logic “0” state. This operation will convert the AT88SC102 from Security Level 1 to

Security Level 2. The action is irreversible.

Note: The address will not change as long as RST is high. CLK should be low when RST is brought low.

This will reset the address counter to 0.

Table 12-2.

FUS

RST

Function of FUS and RST Pin

Used for personalizing the device. FUS must be high to be able to personalize

the device when the issuer fuse is unblown. In Security Level 1, the FUS pin

may be forced low to simulate Security Level 2. In Security Level 2, the FUS

pin has no function.

This pin is used to reset the address counter address to 0. It is also used in

writing the issuer fuse and the EC2EN FUSE low. When the FUS pin is low

and the RST pin is high, the part is in stand-by mode.

16 AT88SC102

1419C–SMEM–6/08

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