24C64 datasheet(8/12 Pages) MICROCHIP

Part #	24C64

Description	64K SPI Bus Serial EEPROM

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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8 / 12 page

25AA640/25LC640/25C640

DS21223A-page 8

Preliminary

3.4

Write Enable (WREN) and Write

Disable (WRDI)

The 25xx640 contains a write enable latch.

See

Table 3-3 for the Write Protect Functionality Matrix.

This latch must be set before any write operation will

be completed internally. The WREN instruction will set

the latch, and the WRDI will reset the latch.

The following is a list of conditions under which the

write enable latch will be reset:

• Power-up

• WRDI instruction successfully executed

• WRSR instruction successfully executed

• WRITE instruction successfully executed

FIGURE 3-4:

WRITE ENABLE SEQUENCE

FIGURE 3-5:

WRITE DISABLE SEQUENCE

SCK

high impedance

SCK

high impedance

24C64 Datasheet(PDF) 8 Page - Microchip Technology