MCP79520-ISLASHMS datasheet(40/58 Pages) MICROCHIP

40 / 58 page

MCP7951X/MCP7952X

DS20002300D-page 40

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6.3

EEPROM

The MCP7952X features 2 Kbits of EEPROM and the

MCP7951X features 1 Kbit of EEPROM. It is organized

in 8-byte pages with software write protection

configurable through the STATUS register.

6.3.1

WRITE ENABLE AND WRITE

DISABLE

The MCP795XX contains a write enable latch. This

latch must be set before any write operation will be

completed internally. The EEWREN instruction will set

the latch and the EEWRDI instruction 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

• EEWRITE instruction successfully executed

• SRWRITE instruction successfully executed

• IDWRITE instruction successfully executed

• Unlock sequence for protected EEPROM not

followed correctly

FIGURE 6-6:

WRITE ENABLE SEQUENCE

FIGURE 6-7:

WRITE DISABLE SEQUENCE

SCK

234567

High-Impedance

0000

SCK

456

High-Impedance

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