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

WRITE

A WRITE operation sets the bit(s) to a logic “0”

OPERATION:

CLK = “0”

PGM “0” → “1” (I/O switches to an input)

I/O = “0” (input = “0” for write operation)

CLK “0”→ “1” (rising edge of CLK starts the write operation)

PGM “1”→ “0”

I/O “0”→ “Z” (high-impedance)

Wait tCHP (see “AC Electrical Characteristics”)

CLK “1”→ “0” (falling edge of CLK ends the WRITE operation)

Note: The falling edge of CLK that ends the write operation does not increment the address counter.

FUNCTION:

Non-application Zones:

The write operation is inhibited for addresses where security prevents a write operation (see Tables 1 and 2).

Application Zones:

The Application Zones can be written when:

Security Level 1: SV = “1”

Security Level 2: SV = “1”and P1 = “1” for AZ1. SV = “1” and P2 = “1” for AZ2

ERASE

Operation

Sequence

CLK = “0”

PGM “0” → “1” (I/O switches to an input)

I/O = “1” (input = “1” for erase operation)

CLK “0” → “1” (rising edge of CLK starts the erase operation)

PGM “1” → “0”

I/O “1” → “Z” (high-impedance)

Wait tCHP (see “AC Electrical Characteristics”)

CLK “1” → “0” (falling edge of CLK ends the erase operation)

Note: The falling edge of CLK that ends the erase operation does not increment the address counter.

ERASE

(Non-

Application

Zones)

An erase operation sets the bits to logic “1”. The EEPROM memory is organized into 16 bit words. Although erases

are performed on single bits, the erase operation clears an entire word in the memory (except for the application

zones in Security Level 2). Therefore, performing an erase on any bit in the word will clear all 16 bits of that word to

logic “1”.

OPERATION:

Perform “Erase Operation Sequence” as specified above.

FUNCTION:

The erase operation is inhibited for addresses where security prevents an erase operation (see Tables 1 and 2.)

ERASE

(Application

Zones)

Security Level 1

Security level 1: (Issuer Fuse = “1” and FUS pin = “0”)

The Application Zone can only be erased when SV = “1”.

OPERATION:

Increment address counter to any bit within AZ1 or AZ2. Perform “Erase Operation Sequence” as specified above.

FUNCTION:

This operation will erase the entire 16-bit word containing the bit.

14 AT88SC102

1419C–SMEM–6/08

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