24CS512 datasheet(22/66 Pages) MICROCHIP

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24CS512

DS20005769C-page 22

 2018-2021 Microchip Technology Inc.

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, the host responds with an Acknowledge.

As long as the EEPROM receives an ACK, it will con-

tinue to increment the word address and serially clock

out the sequential data byte. When the maximum mem-

ory address is reached, the internal Address Pointer

will automatically roll over from word address, FFFFh,

to word address, 0000h, if the host acknowledges the

byte received from the word address FFFFh.

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

010

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

A1 A0

A2 A1 A0

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 A0

ACK

from

Host

ACK

from

Host

ACK

from

Client

Start by

Host

MSb

123

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

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