24CSM01-ESLASHP datasheet(26/63 Pages) MICROCHIP

26 / 63 page

24CSM01

DS20006781B

-page 26

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

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 depend 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 register unlocked (LOCK = ‘0’), the

confirmation byte must be 66h.

Table 9-4 illustrates the valid data values for the

confirmation

byte.

Figure 9-1

illustrates

the

Configuration register write sequence.

FIGURE 9-1:

CONFIGURATION REGISTER WRITE SEQUENCE

Note:

Writing to the Configuration register

cannot be inhibited by 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

Configuration

after

the

Configuration register has been locked,

the

device

will

acknowledge

the

commands, but no write cycle will occur,

no data will be written and the device will

immediately accept a new command.

Note:

Once it is locked, the Configuration

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 x

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

24CSM01-E/P 数据表(PDF) 26 Page - Microchip Technology

24CSM01-E/P 数据表(HTML) 26 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 61 62 63

数据表下载

链接网址

24CSM01-E/P 数据表(PDF) 26 Page - Microchip Technology

24CSM01-E/P 数据表(HTML) 26 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 61 62 63

数据表 下载

链接网址

数据表下载