24CSM01 datasheet(27/63 Pages) MICROCHIP

27 / 63 page

 2023 Microchip Technology Inc. and its subsidiaries

Preliminary

DS20006781B

-page 27

24CSM01

9.4

Reading the Configuration

When reading the Configuration register, a random

read sequence must be sent to the device (see

Section 7.2

“Random

Read”

for

additional

information). The address values must be compliant

with the values found in Table 9-1, Table 9-2 and

Table 9-3.

Figure 9-2 illustrates the Configuration register read

sequence. It is not possible to read the contents of the

Configuration register with a current address read

sequence as the correct word address bytes must be

sent to the device.

Accessing the Configuration register is only possible if

any sequence or command to the EEPROM (if one has

been sent) has been properly terminated with a Stop

condition. Without proper termination of that previous

sequence, all communications with the Configuration

FIGURE 9-2:

CONFIGURATION REGISTER READ SEQUENCE

Note:

If a Stop condition is issued after the word

address bytes, the read operation to the

Configuration register will not execute

properly.

Note:

The 24CSM01 will automatically roll over

from the second Configuration register

data byte to the first data byte if the host

continues to acknowledge the data bytes

during the read operation.

SCL

MSb

SDA

123

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

Configuration Register

Device Address Byte

D15 00 00 0 D9 D8 0 D7 D6 D5 D4 D3 D2

D1 D0

A2 A1 x

NACK

from

Host

ACK

from

Host

ACK

from

Client

Start by

Host

Stop by

Host

Byte 1 Contents

Byte 0 Contents

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