MCP79411 datasheet(38/60 Pages) MICROCHIP

38 / 60 page

MCP79410/MCP79411/MCP79412

DS20002266E-page 38

 2010-2013 Microchip Technology Inc.

10.2

EEPROM

The MCP794XX features 1Kbits of internal high

endurance EEPROM. This EEPROM block features an

8-byte page.

10.2.1

BLOCK PROTECTION

The EEPROM does not support a hardware write

protection pin, however, software block protection is

available to the user and is configured using the

STATUS register.

10.2.2

STATUS REGISTER

The STATUS register is in the nonvolatile EEPROM

array. To access the STATUS register, the address of

0xFFh is written to and read from. ACK polling may be

used to determine if the write is complete. The bits in

this register are defined as:

• Bit 3:2 (BP<1:0>) are the EEPROM array block

protection bits. If an attempt is made to perform a

write to an area of EEPROM that is protected, the

MCP794XX will acknowledge but the write will not

take place. These bits are in the nonvolatile

EEPROM array. This allows protection of the

following areas:

• The unused bits are reserved at this time and

read as ‘0’.

• With the current address read operation, the

address is not incremented. Consequently, the

subsequent reads are done from the same

location.

If multiple bytes are loaded to the STATUS register,

only the last byte is written. The write to the STATUS

TABLE 10-1:

BLOCK PROTECTION

BP1

BP0

Array Addresses

Write-Protected

None

Upper 1/4

(60h-7Fh)

Upper 1/2

(40h-7Fh)

All

(00h-7Fh)

STATUS REGISTER 0XFF

R/W-0

—

BP1

BP0

—

bit 7

bit 3 bit 2

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

“0” = Bit is clear

“X” = Bit is unknown

bit 7-4

Unimplemented: Read as ‘0’

bit 3-2

BP<1:0>: EEPROM Array Block Protection bits

bit 1-0

Unimplemented: Read as ‘0’

MCP79411 Datasheet(PDF) 38 Page - Microchip Technology

MCP79411 Datasheet(HTML) 38 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Datasheet Download

Link URL