25LC010A データシートの表示（PDF） - Microchip Technology

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25LC010A

1K-4K SPI Serial EEPROM HighTemp Family Data Sheet

Microchip Technology 

25LCXXXA

4.0 DATA PROTECTION

The following protection has been implemented to

prevent inadvertent writes to the array:

• The write enable latch is reset on power-up

• A write enable instruction must be issued to set

the write enable latch

• After a byte write, page write or STATUS register

write, the write enable latch is reset

• CS must be set high after the proper number of

clock cycles to start an internal write cycle

• Access to the array during an internal write cycle

is ignored and programming is continued

5.0 POWER-ON STATE

The 25LCXXXA powers on in the following state:

• The device is in low-power Standby mode

(CS = 1)

• The write enable latch is reset

• SO is in high-impedance state

• A high-to-low-level transition on CS is required to

enter active state

TABLE 5-1: WRITE-PROTECT FUNCTIONALITY MATRIX

WP

(pin 3)

0 (low)

1 (high)

1 (high)

x = don’t care

WEL

(SR bit 1)

x

0

1

Protected Blocks

Protected

Protected

Protected

Unprotected Blocks

Protected

Protected

Writable

STATUS Register

Protected

Protected

Writable

DS22136B-page 14

Preliminary

© 2009 Microchip Technology Inc.

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