24CSM01-ESLASHP datasheet(20/63 Pages) MICROCHIP

20 / 63 page

24CSM01

DS20006781B

-page 20

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

7.2

Random Read

Random read operations allow the host to access any

memory location in a random manner. To perform this

type of read operation, first the word address must be

set. This is done by sending the word address to the

24CSM01 as part of a write operation (R/W bit set

to ‘0’). After the word address is sent, the host

generates a Start condition following the Acknowledge.

This terminates the write operation, but not before the

internal Address Pointer is set. Then, the host issues

the device address byte again but with the R/W bit set

to a logic ‘1’.

The 24CSM01 will then issue an Acknowledge and

transmit the 8-bit data byte. The host will not

acknowledge the transfer, but does generate a Stop

condition which causes the 24CSM01 to discontinue

transmission (Figure 7-2). After a random read

operation, the internal Address Pointer will point to the

last word address location incremented by one.

FIGURE 7-2:

RANDOM READ

SCL

MSb

SDA

6789

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

Device Address Byte

Data Byte (n)

D7 D6 D5 D4

A2 A1 x

D3 D2 D1 D0 0

NACK

from

Host

ACK

from

Client

Stop by

Host

Start by

Host

Note 1:

“Don’t care” bit.

(1)

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