24CS512 datasheet(27/66 Pages) MICROCHIP

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DS20005769C-page 27

24CS512

9.3

Writing to the Configuration

When writing to the Configuration register, a write

sequence must be sent to the device (see Section 6.1

“Byte Write” for additional information). The data

address values must be compliant with the values

found in Table 9-1, Table 9-2 and Table 9-3.

In order for the internal write process to start, both data

bytes (Byte 0 and Byte 1), along with a confirmation

byte, need to be sent to the device. Sending anything

other than these three bytes will cause the write cycle

to abort and the contents of the Configuration register

will not be changed.

The data of the confirmation byte depends on the value

being written to the LOCK bit. If the user intends to lock

the Configuration register (LOCK = 1), the confirmation

byte must be 99h. If the user intends to leave the

must be 66h.

Table 9-4 illustrates the valid data values for the confir-

mation byte. Figure 9-1 illustrates the Configuration

FIGURE 9-1:

CONFIGURATION REGISTER WRITE SEQUENCE

Note:

Writing to the Configuration register can-

not

inhibited

asserting

the

Write-Protect pin. Refer to Section 6.6

“Write Protection”, which describes the

device behavior with respect to the

Write-Protect pin status.

Note:

If an attempt is made to write to the Con-

figuration register after the Configuration

acknowledge the commands, but no write

cycle will occur, no data will be written and

the device will immediately accept a new

command.

Note:

The Configuration register cannot be

unlocked once it is locked.

TABLE 9-4:

CONFIGURATION REGISTER CONFIRMATION BYTE

New LOCK Bit Value

1 (locked)

100

110

0 (unlocked)

011

001

SCL

MSb

SDA

Word Address – Byte 1

Word Address – Byte 0

Device Address Byte

A2 A1 A0

ACK

from

Client

ACK

from

Client

ACK

from

Client

Start by

Host

MSb

123

Configuration Register

D7 D6 D5 D4 D3 D2 D1 D0 0 D7 D6 D5 D4 D3 D2

D1 D0

xx D9

ACK

from

Client

ACK

from

Client

ACK

from

Client

Stop by

Host

Confirmation Byte

Byte 1

Byte 0

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