AT34C02C-TP25-T Просмотр технического описания (PDF) - Atmel Corporation

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AT34C02C-TP25-T

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

Atmel Corporation 

WP Connected to GND or Floating

Set RSWP

W

X

Clear RSWP

W

Programmed

Not Programmed

X

Clear RSWP

W

Not Programmed

X

Table 9. WP Connected to Vcc

ACK

No ACK

ACK

Program reversible write protect register (reversible)

STOP - Indicates permanent write protect register is

programmed

Clear (unprogram) reversible write protect register

(reversible)

WP Connected to Vcc

Command

R/W Bit

Permanent Write

Protect Register

PSWP

1010

R

X

1010

W

X

Reversible Write

Protect Register

RSWP

X

X

Acknowledgment

from Device

ACK

ACK

Action from Device

Read array

Device Write Protect

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

Cannot program write protect registers

Read

RSWP

R

Read

RSWP

R

Set RSWP

W

Set RSWP

W

Clear

RSWP

W

Clear

RSWP

W

Read

Operations

X

Programmed

X

Not Programmed

X

X

Programmed

Programmed

Not Programmed

X

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

Cannot program write protect registers

STOP - Indicates permanent write protect register is

programmed

Cannot write to write protect registers

Read operations are initiated the same way as write operations with the exception that the

read/write select bit in the device address word is set to one. There are three read operations:

current address read, random address read and sequential read.

CURRENT ADDRESS READ: The internal data word address counter maintains the last

address accessed during the last read or write operation, incremented by one. This address

stays valid between operations as long as the chip power is maintained. The address “roll over”

during read is from the last byte of the last memory page to the first byte of the first page.

10 AT34C02C

5242B–SEEPR–01/09

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