AT34C02C-TH-B(2006) 查看數據表（PDF） - Atmel Corporation

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AT34C02C-TH-B
(Rev.:2006)

Two-wire Serial EEPROM with Permanent and Reversible Software Write Protect

Atmel Corporation 

AT34C02C [Preliminary]

Table 6. Write Protection

Pin

Preamble

RW

Command

A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0

Set PSWP

A2 A1 A0

0

1

1

0 A2 A1 A0 0

Set RSWP

0

0 VHV 0

1

1

0

0

0

1

0

Clear RSWP 0

1 VHV 0

1

1

0

0

1

1

0

Table 7. VHV

Min

VHV

7

Note: VHV - VCC > 4.8V

Max

Units

10

V

Table 8. WP Connected to GND or Floating

WP Connected to GND or Floating

Command

R/W Bit

Permanent Write

Protect Register

PSWP

1010

R

X

1010

W

Programmed

1010

W

X

1010

W

Not Programmed

Reversible Write

Protect Register

RSWP

X

X

Programmed

Not Programmed

Acknowledgment

from Device

ACK

ACK

ACK

ACK

Action from Device

Can write to second Half (80H - FFH) only

Can write to second Half (80H - FFH) only

Can write to full array

Read PSWP

R

Programmed

X

Read PSWP

R

Not Programmed

X

Set PSWP

W

Programmed

X

Set PSWP

W

Not Programmed

X

No ACK

ACK

No ACK

ACK

STOP - Indicates permanent write protect register is

programmed

Read out data don't care. Indicates PSWP register

is not programmed

STOP - Indicates permanent write protect register is

programmed

Program permanent write protect register

(irreversible)

Read RSWP

Read RSWP

Set RSWP

Set RSWP

Clear RSWP

Clear RSWP

R

X

Programmed

R

X

Not Programmed

W

X

Programmed

W

X

Not Programmed

W

Programmed

X

W

Not Programmed

X

No ACK

ACK

No ACK

ACK

No ACK

ACK

STOP - Indicates reversible write protect register is

programmed

Read out data don't care. Indicates RSWP register

is not programmed

STOP - Indicates reversible write protect register is

programmed

Program reversible write protect register (reversible)

STOP - Indicates permanent write protect register is

programmed

Clear (unprogram) reversible write protect register

(reversible)

11

5185A–SEEPR–9/06

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