AT88SC102 查看數據表（PDF） - Unspecified

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AT88SC102

1K EEPROM– Security Logic with Two Application Zones

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6.1 Internal Flags

Table 6-2. Definition of AT88SC102 Internal Flags

Zone

Definition

Operation

The SV flag is set by correctly matching the 16-bit

security code bit-by-bit from address 80 through 95

as CLK increments the address counter. The security

code matching operation must be followed

immediately by a validation operation within the

Security Code Attempts Counter (SCAC). This

validation operation requires the user to find a bit in

the first eight bits of the SCAC (addresses 96–103)

that is a logic “1”. A write operation is performed,

SV

Security Validation Flag

followed by an erase. The AT88SC102 will validate

that the comparison was correct by outputting a logic

“1”, and SV will be set. After the erase, all 16 bits in

the SCAC will also be erased. The SV flag remains

set until power to the card is turned off. If the

comparison was in error, or part of the validation was

not performed correctly, the AT88SC102 will output a

logic “0”, showing that the SV flag has not been set.

After eight consecutive incorrect security code

presentations, the card is permanently locked.

If Bit 176 has been programmed to a logic “1”, this

P1

Application Zone 1 Write

Flag

flag is set after Bit 176 has been addressed. The flag

remains set until power to the device is turned off,

even if this bit is written to “0” by a subsequent

operation.

If Bit 177 has been programmed to a logic “1”, this

R1

Application Zone 1 Read

Flag

flag is set after Bit 177 has been addressed. The flag

remains set until power to the device is turned off,

even if this bit is written to “0” by a subsequent

operation.

If Bit 736 has been programmed to a logic “1”, this

P2

Application Zone 2 Write

Flag

flag is set after Bit 736 has been addressed. The flag

remains set until power to the device is turned off,

even if this bit is written to “0” by a subsequent

operation.

If Bit 737 has been programmed to a logic “1”, this

R2

Application Zone 2 Read

Flag

flag is set after Bit 737 has been addressed. The flag

remains set until power to the device is turned off,

even if this bit is written to “0” by a subsequent

operation.

Function

This flag is the master protection

for the memory zones. See

Tables 1 and 2.

P1 and SV must both be set in

order to enable a write command

in the application zone (Security

Mode 2).

R1 or SV must be set in order to

enable Application Zone 1 to be

read.

P2 and SV must both be set in

order to enable a write command

in Application Zone 2 (Security

Mode 2).

R2 or SV must be set in order to

enable Application Zone 2 to be

read.

8 AT88SC102

1419C–SMEM–6/08

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