24CSM01 datasheet(21/63 Pages) MICROCHIP

21 / 63 page

 2023 Microchip Technology Inc. and its subsidiaries

Preliminary

DS20006781B

-page 21

24CSM01

7.3

Sequential Read

A sequential read is initiated by either a current

address read or a random read. After the host receives

a data byte, it responds with an Acknowledge. As long

as the EEPROM receives an ACK, it will continue to

increment the word address and serially clock out the

sequential data byte. When the maximum memory

address is reached, the internal Address Pointer will

automatically roll over from word address 1FFFFh to

word address 00000h if the host acknowledges the

byte received from word address 1FFFFh.

All types of read operations will be terminated if the

host does not respond with an ACK (it NACKs) during

the ninth clock cycle, which will force the device into

Standby mode. After the NACK response, the host may

send a Stop condition to complete the protocol, or it can

send a Start condition to begin the next sequence.

FIGURE 7-3:

SEQUENTIAL READ

SCL

MSb

SDA

123

Word Address – Byte 1

Word Address – Byte 0

Device Address Byte

A15 A14 A13 A12 A11 A10 A9 A8 0 A7 A6 A5 A4 A3 A2

A1 A0

A2 A1 A16

ACK

from

Client

ACK

from

Client

ACK

from

Client

Start by

Host

MSb

123

Data Byte (n+1)

Data Byte (n)

Device Address Byte

010

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

D1 D0

A2 A1 x

ACK

from

Host

ACK

from

Host

ACK

from

Client

Start by

Host

MSb

Data Byte (n+x)

Data Byte (n+3)

Device Byte (n+2)

D7 D6 D5 D4

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

D1 D0

D3 D2 D1

NACK

from

Host

ACK

from

Host

ACK

from

Host

Stop by

Host

Note 1:

“Don’t care” bit.

(1)

Start by

Host

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